Securities - Expected Maturity (Details) (USD $) In Millions, unless otherwise specified
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Jun. 30, 2013
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Dec. 31, 2012
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Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |
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Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount |
$ 6
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[1] |
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Held-to-maturity Securities, Debt Maturities, Yield, within One Year |
5.00%
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[1],[2] |
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Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount |
73
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[1] |
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Held-to-maturity Securities, Debt Maturities, Yield, after One Through Five Years |
2.26%
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[1],[2] |
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Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount |
53,778
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[1] |
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Held-to-maturity Securities, Debt Maturities, Yield, after Five Through Ten Years |
2.54%
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[1],[2] |
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Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount |
1,065
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[1] |
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Held-to-maturity Securities, Debt Maturities, Yield, after Ten Years |
2.57%
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[1],[2] |
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Held-to-maturity Securities, Debt Maturities, Net Carrying Amount |
54,922
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[1] |
49,481
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Held-to-maturity Securities, Debt Maturities, Yield |
2.54%
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[1],[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Fair Value [Abstract] |
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Debt Securities Carried at Fair Value |
281,481
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310,850
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Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |
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Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value |
6
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[1] |
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Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Fair Value |
73
|
[1] |
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Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Fair Value |
51,759
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[1] |
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Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value |
1,018
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[1] |
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US Government Corporations and Agencies Securities [Member]
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Debt Securities Carried at Fair Value, Debt Maturities, Amortized Cost Basis [Abstract] |
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Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Amortized Cost Basis |
545
|
|
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
0.67%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
802
|
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
2.17%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
1,635
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
4.24%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
2
|
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
4.57%
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[2] |
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Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
2,984
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|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield |
3.03%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Fair Value [Abstract] |
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Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Fair Value |
547
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
821
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
1,729
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
2
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Debt Securities Carried at Fair Value |
3,099
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Debt Securities [Member]
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Debt Securities Carried at Fair Value, Debt Maturities, Amortized Cost Basis [Abstract] |
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Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Amortized Cost Basis |
23,029
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
0.99%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
48,451
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
2.69%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
129,297
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
3.14%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
83,106
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
2.83%
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[2] |
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Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
283,883
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield |
2.80%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Fair Value [Abstract] |
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Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Fair Value |
23,081
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
48,761
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
129,167
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
80,472
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Debt Securities Carried at Fair Value |
281,481
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Taxable Securities [Member]
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Debt Securities Carried at Fair Value, Debt Maturities, Amortized Cost Basis [Abstract] |
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Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Amortized Cost Basis |
22,978
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
0.99%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
46,488
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
2.74%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
127,953
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
3.15%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
81,469
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
2.86%
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[2] |
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Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
278,888
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Debt Securities Carried at Fair Value, Debt Maturities, Yield |
2.82%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Fair Value [Abstract] |
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Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Fair Value |
23,030
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
46,802
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
127,837
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
78,851
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Debt Securities Carried at Fair Value |
276,520
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Agency Securities [Member]
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Debt Securities Carried at Fair Value, Debt Maturities, Amortized Cost Basis [Abstract] |
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Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Amortized Cost Basis |
3
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
5.25%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
22,073
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
3.04%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
97,949
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
3.09%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
79,036
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
2.87%
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[2] |
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Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
199,061
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Debt Securities Carried at Fair Value, Debt Maturities, Yield |
3.00%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Fair Value [Abstract] |
|
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Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Fair Value |
3
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
22,113
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
96,834
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
76,355
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Debt Securities Carried at Fair Value |
195,305
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Collateralized Mortgage Obligations [Member]
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Debt Securities Carried at Fair Value, Debt Maturities, Amortized Cost Basis [Abstract] |
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Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Amortized Cost Basis |
125
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
0.81%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
9,068
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
1.24%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
21,946
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
3.41%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
1,040
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
2.78%
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[2] |
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Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
32,179
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Debt Securities Carried at Fair Value, Debt Maturities, Yield |
2.77%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Fair Value [Abstract] |
|
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Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Fair Value |
124
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
8,997
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
22,846
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
1,040
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Debt Securities Carried at Fair Value |
33,007
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Residential Mortgage Backed Securities [Member]
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Debt Securities Carried at Fair Value, Debt Maturities, Amortized Cost Basis [Abstract] |
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Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Amortized Cost Basis |
561
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
3.43%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
4,231
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
4.34%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
2,547
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
4.00%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
474
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
5.27%
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[2] |
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Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
7,813
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Debt Securities Carried at Fair Value, Debt Maturities, Yield |
4.22%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Fair Value [Abstract] |
|
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Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Fair Value |
580
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
4,326
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
2,582
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
538
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Debt Securities Carried at Fair Value |
8,026
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Commercial Mortgage Backed Securities [Member]
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Debt Securities Carried at Fair Value, Debt Maturities, Amortized Cost Basis [Abstract] |
|
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Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Amortized Cost Basis |
1,430
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
5.10%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
1,783
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
6.40%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
1,102
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
2.51%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
23
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|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
3.86%
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[2] |
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Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
4,338
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Debt Securities Carried at Fair Value, Debt Maturities, Yield |
5.06%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Fair Value [Abstract] |
|
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Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Fair Value |
1,475
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
1,965
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
1,043
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
23
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|
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Debt Securities Carried at Fair Value |
4,506
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Foreign Securities [Member]
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Debt Securities Carried at Fair Value, Debt Maturities, Amortized Cost Basis [Abstract] |
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Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Amortized Cost Basis |
17,451
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
0.60%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
2,231
|
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
3.47%
|
[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
149
|
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
3.05%
|
[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
8
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Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
19,839
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield |
0.94%
|
[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Fair Value [Abstract] |
|
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Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Fair Value |
17,436
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
2,265
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
155
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|
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
8
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|
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Debt Securities Carried at Fair Value |
19,864
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Corporate Bond Securities [Member]
|
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Debt Securities Carried at Fair Value, Debt Maturities, Amortized Cost Basis [Abstract] |
|
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Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Amortized Cost Basis |
285
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|
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
2.75%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
638
|
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
2.60%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
180
|
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
4.25%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
103
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
1.09%
|
[2] |
|
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
1,206
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield |
2.73%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, Fair Value [Abstract] |
|
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Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Fair Value |
288
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
653
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
189
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
101
|
|
|
Debt Securities Carried at Fair Value |
1,231
|
|
|
Other Debt Obligations [Member]
|
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Debt Securities Carried at Fair Value, Debt Maturities, Amortized Cost Basis [Abstract] |
|
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Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Amortized Cost Basis |
2,578
|
|
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
0.65%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
5,662
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
1.31%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
2,445
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
1.82%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
783
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
0.96%
|
[2] |
|
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
11,468
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield |
1.25%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, Fair Value [Abstract] |
|
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Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Fair Value |
2,577
|
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
5,662
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
2,459
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
784
|
|
|
Debt Securities Carried at Fair Value |
11,482
|
|
|
Tax-exempt securities [Member]
|
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Debt Securities Carried at Fair Value, Debt Maturities, Amortized Cost Basis [Abstract] |
|
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Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Amortized Cost Basis |
51
|
|
|
Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
2.96%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
1,963
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
1.42%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
1,344
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
2.15%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
1,637
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
1.07%
|
[2] |
|
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
4,995
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield |
1.62%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, Fair Value [Abstract] |
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Fair Value |
51
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
1,959
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
1,330
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
1,621
|
|
|
Debt Securities Carried at Fair Value |
$ 4,961
|
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