Securities - Expected Maturity (Details) (USD $) In Millions, unless otherwise specified
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Sep. 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 |
76
|
[1] |
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Held-to-maturity Securities, Debt Maturities, Yield, after One Through Five Years |
2.29%
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[1],[2] |
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Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount |
53,394
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[1] |
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Held-to-maturity Securities, Debt Maturities, Yield, after Five Through Ten Years |
2.56%
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[1],[2] |
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Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount |
1,173
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[1] |
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Held-to-maturity Securities, Debt Maturities, Yield, after Ten Years |
2.67%
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[1],[2] |
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Held-to-maturity Securities, Debt Maturities, Net Carrying Amount |
54,649
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[1] |
49,481
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Held-to-maturity Securities, Debt Maturities, Yield |
2.56%
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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 |
266,349
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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
|
[1] |
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Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Fair Value |
76
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[1] |
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Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Fair Value |
51,643
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[1] |
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Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value |
1,126
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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 |
544
|
|
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
0.62%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
810
|
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
2.22%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
1,505
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|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
4.25%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
13
|
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
2.72%
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[2] |
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Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
2,872
|
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield |
2.98%
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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 |
546
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
830
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
1,582
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
13
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Debt Securities Carried at Fair Value |
2,971
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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 |
24,772
|
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
1.42%
|
[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
38,912
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
2.62%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
127,777
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
3.11%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
77,188
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
2.85%
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[2] |
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Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
268,649
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield |
2.81%
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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 |
24,814
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
39,311
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
127,208
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
75,016
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Debt Securities Carried at Fair Value |
266,349
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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 |
24,336
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
1.42%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
37,037
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
2.68%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
125,986
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
3.12%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
76,026
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
2.88%
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[2] |
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Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
263,385
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Debt Securities Carried at Fair Value, Debt Maturities, Yield |
2.84%
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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 |
24,378
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
37,431
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
125,429
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
73,877
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Debt Securities Carried at Fair Value |
261,115
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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 |
14
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
4.58%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
16,868
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
2.89%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
99,186
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
3.10%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
74,405
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
2.90%
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[2] |
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Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
190,473
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Debt Securities Carried at Fair Value, Debt Maturities, Yield |
3.01%
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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 |
16
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
17,052
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
98,361
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
72,222
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Debt Securities Carried at Fair Value |
187,651
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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 |
1,525
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
0.04%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
6,315
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
1.48%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
19,816
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
3.26%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
12
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
1.39%
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[2] |
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Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
27,668
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Debt Securities Carried at Fair Value, Debt Maturities, Yield |
2.67%
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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 |
1,533
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
6,300
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
20,052
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
13
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Debt Securities Carried at Fair Value |
27,898
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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 |
366
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
4.80%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
3,788
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
4.54%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
1,868
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
3.51%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
766
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
2.82%
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[2] |
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Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
6,788
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Debt Securities Carried at Fair Value, Debt Maturities, Yield |
4.07%
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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 |
373
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|
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
3,892
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
1,867
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
797
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Debt Securities Carried at Fair Value |
6,929
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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 |
1,721
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
5.08%
|
[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
736
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
5.46%
|
[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
1,092
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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 |
18
|
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
3.45%
|
[2] |
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Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
3,567
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Debt Securities Carried at Fair Value, Debt Maturities, Yield |
4.37%
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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 |
1,759
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
778
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
1,030
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
18
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|
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Debt Securities Carried at Fair Value |
3,585
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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 |
15,411
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
1.02%
|
[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
2,152
|
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
3.91%
|
[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
152
|
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
3.06%
|
[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 |
17,723
|
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield |
1.38%
|
[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 |
15,396
|
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
2,185
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
157
|
|
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
8
|
|
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Debt Securities Carried at Fair Value |
17,746
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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 |
442
|
|
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
2.49%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
564
|
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
2.66%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
144
|
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
4.31%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
2
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
6.34%
|
[2] |
|
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
1,152
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield |
2.79%
|
[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 |
446
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
573
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
148
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
3
|
|
|
Debt Securities Carried at Fair Value |
1,170
|
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|
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 |
4,313
|
|
|
Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
1.61%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
5,804
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
1.45%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
2,223
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
1.97%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
802
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
1.04%
|
[2] |
|
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
13,142
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield |
1.57%
|
[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 |
4,309
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
5,821
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
2,232
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
803
|
|
|
Debt Securities Carried at Fair Value |
13,165
|
|
|
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 |
436
|
|
|
Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
1.21%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
1,875
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
1.56%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
1,791
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
1.91%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
1,162
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
0.77%
|
[2] |
|
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
5,264
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield |
1.57%
|
[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 |
436
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
1,880
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
1,779
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
1,139
|
|
|
Debt Securities Carried at Fair Value |
$ 5,234
|
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|
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