Securities - Expected Maturity (Details) (USD $) In Millions, unless otherwise specified
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Mar. 31, 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 |
345
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[1] |
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Held-to-maturity Securities, Debt Maturities, Yield, after One Through Five Years |
2.40%
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[1],[2] |
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Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount |
49,121
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[1] |
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Held-to-maturity Securities, Debt Maturities, Yield, after Five Through Ten Years |
2.50%
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[1],[2] |
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Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount |
105
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[1] |
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Held-to-maturity Securities, Debt Maturities, Yield, after Ten Years |
1.44%
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[1],[2] |
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Held-to-maturity Securities, Debt Maturities, Net Carrying Amount |
49,577
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[1] |
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Held-to-maturity Securities, Debt Maturities, Yield |
2.50%
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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 |
305,132
|
|
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 |
344
|
[1] |
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Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Fair Value |
49,318
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[1] |
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Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value |
106
|
[1] |
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Held-to-maturity Securities, Debt Maturities, Fair Value |
49,774
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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 |
568
|
|
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
0.73%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
777
|
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
2.14%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
5,123
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|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
2.78%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
14,554
|
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
3.01%
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[2] |
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Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
21,022
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|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield |
2.86%
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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 |
571
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
804
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
5,323
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
14,602
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Debt Securities Carried at Fair Value |
21,300
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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 |
17,463
|
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
1.13%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
60,854
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
2.79%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
176,065
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
3.01%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
45,367
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
2.60%
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[2] |
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Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
299,749
|
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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 |
17,500
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
61,746
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
180,629
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
45,257
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Debt Securities Carried at Fair Value |
305,132
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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 |
17,422
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
1.13%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
58,675
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
2.84%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
175,072
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
3.01%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
43,973
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
2.65%
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[2] |
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Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
295,142
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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 |
17,456
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
59,565
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
179,635
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
43,894
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Debt Securities Carried at Fair Value |
300,550
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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 |
4
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
5.00%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
31,415
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
3.10%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
140,985
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
2.95%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
27,859
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
2.47%
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[2] |
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Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
200,263
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield |
2.91%
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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 |
4
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
31,863
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
143,922
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
27,657
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Debt Securities Carried at Fair Value |
203,446
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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 |
10
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
6.99%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
11,120
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
1.30%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
23,328
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
3.44%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
15
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
1.63%
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[2] |
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Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
34,473
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Debt Securities Carried at Fair Value, Debt Maturities, Yield |
2.71%
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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 |
10
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
11,076
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
24,618
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
15
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Debt Securities Carried at Fair Value |
35,719
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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 |
620
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
4.50%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
4,740
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
4.26%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
2,670
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
4.10%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
561
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
4.88%
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[2] |
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Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
8,591
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Debt Securities Carried at Fair Value, Debt Maturities, Yield |
4.28%
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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 |
618
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
4,865
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
2,746
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
648
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Debt Securities Carried at Fair Value |
8,877
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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 |
1,032
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
5.26%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
2,463
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
6.10%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
130
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
2.95%
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[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
17
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
4.46%
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[2] |
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Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
3,642
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Debt Securities Carried at Fair Value, Debt Maturities, Yield |
5.72%
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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 |
1,076
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
2,712
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
131
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
18
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Debt Securities Carried at Fair Value |
3,937
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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 |
13,300
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
0.56%
|
[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
1,331
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
5.90%
|
[2] |
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
157
|
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
2.42%
|
[2] |
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Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
14,788
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield |
1.07%
|
[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 |
13,285
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
1,384
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
163
|
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Debt Securities Carried at Fair Value |
14,832
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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 |
282
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|
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Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
3.00%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
778
|
|
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Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
2.64%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
186
|
|
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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 |
103
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years |
1.10%
|
[2] |
|
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis |
1,349
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield |
2.81%
|
[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 |
287
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
793
|
|
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Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
208
|
|
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Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
97
|
|
|
Debt Securities Carried at Fair Value |
1,385
|
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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 |
1,606
|
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|
Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
1.49%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
6,051
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
1.33%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
2,493
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
2.09%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
864
|
|
|
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 |
11,014
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield |
1.50%
|
[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 |
1,605
|
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Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
6,068
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
2,524
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
857
|
|
|
Debt Securities Carried at Fair Value |
11,054
|
|
|
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 |
41
|
|
|
Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year |
2.69%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis |
2,179
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years |
1.23%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis |
993
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years |
2.09%
|
[2] |
|
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis |
1,394
|
|
|
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 |
4,607
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Yield |
1.51%
|
[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 |
44
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value |
2,181
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value |
994
|
|
|
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value |
1,363
|
|
|
Debt Securities Carried at Fair Value |
$ 4,582
|
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