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Commitments and Contingencies - Credit Extension Commitments (Details) (USD $)
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Sep. 30, 2012
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Jun. 30, 2012
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Dec. 31, 2011
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Sep. 30, 2011
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Jun. 30, 2011
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Dec. 31, 2010
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| Credit Extension Commitments [Abstract] | ||||||||||||
| Legally Binding Unfunded Commitments Syndicated | $ 24,100,000,000 | $ 27,100,000,000 | ||||||||||
| Carrying Amount Credit Extension Commitments Syndicated | 541,000,000 | 741,000,000 | ||||||||||
| Deferred revenue related to binding unfunded lending commitments | 23,000,000 | 27,000,000 | ||||||||||
| Other Liabilities Reserve For Unfunded Lending Commitments | 518,000,000 | 574,000,000 | 714,000,000 | 790,000,000 | 897,000,000 | 1,188,000,000 | ||||||
| Notional Amount Of Credit Extension Commitments Under Fair Value Option | 20,500,000,000 | 25,700,000,000 | ||||||||||
| Notional Amount of Credit Extension Commitments [Abstract] | ||||||||||||
| Expire in One Year or Less | 558,715,000,000 | 576,860,000,000 | ||||||||||
| Expire After One Year Through Three Years | 105,422,000,000 | 112,137,000,000 | ||||||||||
| Expire After Three Years Through Five Years | 155,874,000,000 | 148,171,000,000 | ||||||||||
| Expire After Five Years | 43,824,000,000 | 57,963,000,000 | ||||||||||
| Notional Amount Of Credit Extension Commitments | 863,835,000,000 | 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 | 33,400,000,000 | 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 | 13,000,000,000 | 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 | 134,387,000,000 | 127,763,000,000 | ||||||||||
| Expire After One Year Through Three Years | 105,422,000,000 | 112,137,000,000 | ||||||||||
| Expire After Three Years Through Five Years | 155,874,000,000 | 148,171,000,000 | ||||||||||
| Expire After Five Years | 43,824,000,000 | 57,963,000,000 | ||||||||||
| Notional Amount Of Credit Extension Commitments | 439,507,000,000 | 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 | 101,289,000,000 | 96,291,000,000 | ||||||||||
| Expire After One Year Through Three Years | 79,744,000,000 | 85,413,000,000 | ||||||||||
| Expire After Three Years Through Five Years | 128,455,000,000 | 120,770,000,000 | ||||||||||
| Expire After Five Years | 17,350,000,000 | 15,009,000,000 | ||||||||||
| Notional Amount Of Credit Extension Commitments | 326,838,000,000 | 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 | 2,120,000,000 | 1,679,000,000 | ||||||||||
| Expire After One Year Through Three Years | 12,136,000,000 | 7,765,000,000 | ||||||||||
| Expire After Three Years Through Five Years | 22,910,000,000 | 20,963,000,000 | ||||||||||
| Expire After Five Years | 25,338,000,000 | 37,066,000,000 | ||||||||||
| Notional Amount Of Credit Extension Commitments | 62,504,000,000 | 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 | 28,959,000,000 | 26,965,000,000 | ||||||||||
| Expire After One Year Through Three Years | 13,467,000,000 | 18,932,000,000 | ||||||||||
| Expire After Three Years Through Five Years | 4,499,000,000 | 6,433,000,000 | ||||||||||
| Expire After Five Years | 221,000,000 | 5,505,000,000 | ||||||||||
| Notional Amount Of Credit Extension Commitments | 47,146,000,000 | [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 | 725,000,000 | 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 | 2,019,000,000 | 2,828,000,000 | ||||||||||
| Expire After One Year Through Three Years | 75,000,000 | 27,000,000 | ||||||||||
| Expire After Three Years Through Five Years | 10,000,000 | 5,000,000 | ||||||||||
| Expire After Five Years | 915,000,000 | 383,000,000 | ||||||||||
| Notional Amount Of Credit Extension Commitments | 3,019,000,000 | 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 | 424,328,000,000 | 449,097,000,000 | ||||||||||
| Notional Amount Of Credit Extension Commitments | 424,328,000,000 | [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 | $ 635,000,000 | $ 1,249,000,000 | ||||||||||
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