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Commitments and Contingencies - Credit Extension Commitments (Details) (USD $)
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2011
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Jun. 30, 2011
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Mar. 31, 2011
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Dec. 31, 2010
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| Credit Extension Commitments [Abstract] | ||||||||||||
| Legally Binding Unfunded Commitments Syndicated | $ 24,400,000,000 | $ 27,100,000,000 | ||||||||||
| Carrying Amount Credit Extension Commitments Syndicated | 599,000,000 | 741,000,000 | ||||||||||
| Deferred revenue related to binding unfunded lending commitments | 25,000,000 | 27,000,000 | ||||||||||
| Other Liabilities Reserve For Unfunded Lending Commitments | 574,000,000 | 651,000,000 | 714,000,000 | 897,000,000 | 961,000,000 | 1,188,000,000 | ||||||
| Notional Amount Of Credit Extension Commitments Under Fair Value Option | 21,800,000,000 | 25,700,000,000 | ||||||||||
| Notional Amount of Credit Extension Commitments [Abstract] | ||||||||||||
| Expire in One Year or Less | 561,883,000,000 | 576,860,000,000 | ||||||||||
| Expire After One Year Through Three Years | 105,778,000,000 | 112,137,000,000 | ||||||||||
| Expire After Three Years Through Five Years | 152,913,000,000 | 148,171,000,000 | ||||||||||
| Expire After Five Years | 47,142,000,000 | 57,963,000,000 | ||||||||||
| Notional Amount Of Credit Extension Commitments | 867,716,000,000 | 895,131,000,000 | ||||||||||
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External Credit Rating, Investment Grade [Member]
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| Notional Amount of Credit Extension Commitments [Abstract] | ||||||||||||
| Notional amount of Sblcs and financial guarantees | 37,400,000,000 | 39,200,000,000 | ||||||||||
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External Credit Rating, Non Investment Grade [Member]
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| Notional Amount of Credit Extension Commitments [Abstract] | ||||||||||||
| Notional amount of Sblcs and financial guarantees | 14,300,000,000 | 17,800,000,000 | ||||||||||
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Legally Binding Commitments [Member]
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| Notional Amount of Credit Extension Commitments [Abstract] | ||||||||||||
| Expire in One Year or Less | 130,155,000,000 | 127,763,000,000 | ||||||||||
| Expire After One Year Through Three Years | 105,778,000,000 | 112,137,000,000 | ||||||||||
| Expire After Three Years Through Five Years | 152,913,000,000 | 148,171,000,000 | ||||||||||
| Expire After Five Years | 47,142,000,000 | 57,963,000,000 | ||||||||||
| Notional Amount Of Credit Extension Commitments | 435,988,000,000 | 446,034,000,000 | ||||||||||
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Loan Commitments [Member]
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| Notional Amount of Credit Extension Commitments [Abstract] | ||||||||||||
| Expire in One Year or Less | 98,255,000,000 | 96,291,000,000 | ||||||||||
| Expire After One Year Through Three Years | 78,145,000,000 | 85,413,000,000 | ||||||||||
| Expire After Three Years Through Five Years | 124,964,000,000 | 120,770,000,000 | ||||||||||
| Expire After Five Years | 13,707,000,000 | 15,009,000,000 | ||||||||||
| Notional Amount Of Credit Extension Commitments | 315,071,000,000 | 317,483,000,000 | ||||||||||
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Home Equity [Member]
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| Notional Amount of Credit Extension Commitments [Abstract] | ||||||||||||
| Expire in One Year or Less | 1,965,000,000 | 1,679,000,000 | ||||||||||
| Expire After One Year Through Three Years | 10,660,000,000 | 7,765,000,000 | ||||||||||
| Expire After Three Years Through Five Years | 22,349,000,000 | 20,963,000,000 | ||||||||||
| Expire After Five Years | 29,967,000,000 | 37,066,000,000 | ||||||||||
| Notional Amount Of Credit Extension Commitments | 64,941,000,000 | 67,473,000,000 | ||||||||||
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Financial Standby Letter Of Credit And Financial Guarantee [Member]
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| Notional Amount of Credit Extension Commitments [Abstract] | ||||||||||||
| Expire in One Year or Less | 27,602,000,000 | 26,965,000,000 | ||||||||||
| Expire After One Year Through Three Years | 16,900,000,000 | 18,932,000,000 | ||||||||||
| Expire After Three Years Through Five Years | 5,577,000,000 | 6,433,000,000 | ||||||||||
| Expire After Five Years | 2,291,000,000 | 5,505,000,000 | ||||||||||
| Notional Amount Of Credit Extension Commitments | 52,370,000,000 | [1] | 57,835,000,000 | [1] | ||||||||
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Financial Standby Letter Of Credit And Financial Guarantee [Member] | Consumer Letter of Credit [Member]
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| Notional Amount of Credit Extension Commitments [Abstract] | ||||||||||||
| Notional Amount Of Credit Extension Commitments | 635,000,000 | 859,000,000 | ||||||||||
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Letter of Credit [Member]
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| Notional Amount of Credit Extension Commitments [Abstract] | ||||||||||||
| Expire in One Year or Less | 2,333,000,000 | 2,828,000,000 | ||||||||||
| Expire After One Year Through Three Years | 73,000,000 | 27,000,000 | ||||||||||
| Expire After Three Years Through Five Years | 23,000,000 | 5,000,000 | ||||||||||
| Expire After Five Years | 1,177,000,000 | 383,000,000 | ||||||||||
| Notional Amount Of Credit Extension Commitments | 3,606,000,000 | 3,243,000,000 | ||||||||||
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Credit Card Lines [Member]
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| Notional Amount of Credit Extension Commitments [Abstract] | ||||||||||||
| Expire in One Year or Less | 431,728,000,000 | 449,097,000,000 | ||||||||||
| Notional Amount Of Credit Extension Commitments | 431,728,000,000 | [2] | 449,097,000,000 | [2] | ||||||||
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Unfunded loan commitments [Member]
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| Credit Extension Commitments [Abstract] | ||||||||||||
| Fair Value Carrying Amount Liabilities | $ 948,000,000 | $ 1,249,000,000 | ||||||||||
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