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Securitizations and Variable Interest Entities (Details) (USD $)
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Dec. 31, 2008
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| Variable Interest Entity Consolidated Carrying Amount Assets and Liabilities | |||||||||||
| Cash and due from banks | $ 21,860,000,000 | $ 19,440,000,000 | $ 16,044,000,000 | $ 27,080,000,000 | |||||||
| Trading assets | 57,482,000,000 | 77,814,000,000 | |||||||||
| Securities available for sale | 235,199,000,000 | 222,613,000,000 | |||||||||
| Mortgages held for sale | 47,149,000,000 | 48,357,000,000 | |||||||||
| Loans | 799,574,000,000 | 769,631,000,000 | 757,267,000,000 | 782,770,000,000 | 864,830,000,000 | ||||||
| MSRs (carried at fair value) | 11,538,000,000 | 12,603,000,000 | |||||||||
| Other assets | 93,578,000,000 | 101,022,000,000 | |||||||||
| Total assets | 1,422,968,000,000 | [1] | 1,313,867,000,000 | [1] | |||||||
| Short-term borrowings, Amount | 57,175,000,000 | 49,091,000,000 | 55,401,000,000 | ||||||||
| Accrued expenses and other liabilities | 76,668,000,000 | 77,665,000,000 | |||||||||
| Long-term debt (includes $1 and $0 carried at fair value) | 127,379,000,000 | 125,354,000,000 | |||||||||
| Total liabilities | 1,264,057,000,000 | [2] | 1,172,180,000,000 | [2] | |||||||
| Noncontrolling interests | 1,357,000,000 | 1,446,000,000 | |||||||||
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VIEs that we do not consolidate [Member]
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| Variable Interest Entity Consolidated Carrying Amount Assets and Liabilities | |||||||||||
| Cash and due from banks | 0 | 0 | |||||||||
| Trading assets | 1,902,000,000 | 3,723,000,000 | |||||||||
| Securities available for sale | 19,900,000,000 | 21,708,000,000 | |||||||||
| Mortgages held for sale | 0 | 0 | |||||||||
| Loans | 9,841,000,000 | 11,404,000,000 | |||||||||
| MSRs (carried at fair value) | 11,114,000,000 | 12,080,000,000 | |||||||||
| Other assets | 4,993,000,000 | 4,494,000,000 | |||||||||
| Total assets | 47,750,000,000 | 53,409,000,000 | |||||||||
| Short-term borrowings, Amount | 0 | 0 | |||||||||
| Accrued expenses and other liabilities | 3,441,000,000 | 3,350,000,000 | |||||||||
| Long-term debt (includes $1 and $0 carried at fair value) | 0 | 0 | |||||||||
| Total liabilities | 3,441,000,000 | 3,350,000,000 | |||||||||
| Noncontrolling interests | 0 | 0 | |||||||||
| Net assets | 44,309,000,000 | 50,059,000,000 | |||||||||
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VIEs that we consolidate [Member]
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| Variable Interest Entity Consolidated Carrying Amount Assets and Liabilities | |||||||||||
| Cash and due from banks | 260,000,000 | 321,000,000 | |||||||||
| Trading assets | 114,000,000 | 293,000,000 | |||||||||
| Securities available for sale | 2,772,000,000 | 3,332,000,000 | |||||||||
| Mortgages held for sale | 469,000,000 | 444,000,000 | |||||||||
| Loans | 10,553,000,000 | 11,967,000,000 | |||||||||
| MSRs (carried at fair value) | 0 | 0 | |||||||||
| Other assets | 457,000,000 | 1,858,000,000 | |||||||||
| Total assets | 14,625,000,000 | 18,215,000,000 | |||||||||
| Short-term borrowings, Amount | 2,059,000,000 | 3,450,000,000 | |||||||||
| Accrued expenses and other liabilities | 901,000,000 | 1,138,000,000 | |||||||||
| Long-term debt (includes $1 and $0 carried at fair value) | 3,483,000,000 | 4,932,000,000 | |||||||||
| Total liabilities | 6,443,000,000 | 9,520,000,000 | |||||||||
| Noncontrolling interests | 48,000,000 | 61,000,000 | |||||||||
| Net assets | 8,134,000,000 | 8,634,000,000 | |||||||||
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Transfers Accounted For As Secured Borrowings [Member]
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| Variable Interest Entity Consolidated Carrying Amount Assets and Liabilities | |||||||||||
| Cash and due from banks | 30,000,000 | 11,000,000 | |||||||||
| Trading assets | 218,000,000 | 30,000,000 | |||||||||
| Securities available for sale | 14,848,000,000 | 11,671,000,000 | |||||||||
| Mortgages held for sale | 0 | 0 | |||||||||
| Loans | 7,088,000,000 | 7,181,000,000 | |||||||||
| MSRs (carried at fair value) | 0 | 0 | |||||||||
| Other assets | 161,000,000 | 137,000,000 | |||||||||
| Total assets | 22,345,000,000 | 19,030,000,000 | |||||||||
| Short-term borrowings, Amount | 13,228,000,000 | 10,682,000,000 | |||||||||
| Accrued expenses and other liabilities | 20,000,000 | 121,000,000 | |||||||||
| Long-term debt (includes $1 and $0 carried at fair value) | 6,520,000,000 | 6,686,000,000 | |||||||||
| Total liabilities | 19,768,000,000 | 17,489,000,000 | |||||||||
| Noncontrolling interests | 0 | 0 | |||||||||
| Net assets | 2,577,000,000 | 1,541,000,000 | |||||||||
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Total VIE [Member]
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| Variable Interest Entity Consolidated Carrying Amount Assets and Liabilities | |||||||||||
| Cash and due from banks | 290,000,000 | 332,000,000 | |||||||||
| Trading assets | 2,234,000,000 | 4,046,000,000 | |||||||||
| Securities available for sale | 37,520,000,000 | 36,711,000,000 | |||||||||
| Mortgages held for sale | 469,000,000 | 444,000,000 | |||||||||
| Loans | 27,482,000,000 | 30,552,000,000 | |||||||||
| MSRs (carried at fair value) | 11,114,000,000 | 12,080,000,000 | |||||||||
| Other assets | 5,611,000,000 | 6,489,000,000 | |||||||||
| Total assets | 84,720,000,000 | 90,654,000,000 | |||||||||
| Short-term borrowings, Amount | 15,287,000,000 | 14,132,000,000 | |||||||||
| Accrued expenses and other liabilities | 4,362,000,000 | 4,609,000,000 | |||||||||
| Long-term debt (includes $1 and $0 carried at fair value) | 10,003,000,000 | 11,618,000,000 | |||||||||
| Total liabilities | 29,652,000,000 | 30,359,000,000 | |||||||||
| Noncontrolling interests | 48,000,000 | 61,000,000 | |||||||||
| Net assets | $ 55,020,000,000 | $ 60,234,000,000 | |||||||||
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