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Commitments, Contingencies and Guarantees - Outstanding Claims (Details) (USD $)
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3 Months Ended | 9 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | |||||||||||||||||||||
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Sep. 30, 2012
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Mar. 31, 2012
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Sep. 30, 2011
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Jun. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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Dec. 31, 2011
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Sep. 30, 2012
Minimum [Member]
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Sep. 30, 2012
Maximum [Member]
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Sep. 30, 2012
Repurchases
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Sep. 30, 2011
Repurchases
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Sep. 30, 2012
Repurchases
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Sep. 30, 2011
Repurchases
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Sep. 30, 2012
Indemnification payments
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Sep. 30, 2011
Indemnification payments
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Sep. 30, 2012
Indemnification payments
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Sep. 30, 2011
Indemnification payments
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Sep. 30, 2012
GSEs
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Dec. 31, 2011
GSEs
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Sep. 30, 2012
Non-GSEs
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Sep. 30, 2011
Non-GSEs
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Sep. 30, 2012
Monoline
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Dec. 31, 2011
Monoline
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Sep. 30, 2012
Whole-loan Investors and private-label securitization trustees and other
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Sep. 30, 2012
Whole-loan Investors and private-label securitization trustees and other
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Dec. 31, 2011
Whole-loan Investors and private-label securitization trustees and other
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| Outstanding Claims [Abstract] | ||||||||||||||||||||||||||||||||
| New repurchase claims | $ 800,000,000 | $ 3,300,000,000 | $ 665,000,000 | |||||||||||||||||||||||||||||
| Outstanding Claims By Counterparty | 4,565,000,000 | 4,565,000,000 | 1,302,000,000 | 74,000,000 | 65,000,000 | 147,000,000 | 136,000,000 | 4,344,000,000 | 4,344,000,000 | 1,101,000,000 | ||||||||||||||||||||||
| Claims Outstanding Without a Valid Defect | 4,500,000,000 | 4,500,000,000 | 4,292,000,000 | 4,292,000,000 | ||||||||||||||||||||||||||||
| Outstanding Claims in Review Process | 65,000,000 | 65,000,000 | 52,000,000 | 52,000,000 | ||||||||||||||||||||||||||||
| Timeframe To Resolve Repurchase Claims In Dispute | 60 days | 90 days | ||||||||||||||||||||||||||||||
| Inactive Claims, Threshold Period of Inactivity after Denial | 6 months | |||||||||||||||||||||||||||||||
| Repurchase Demands Received Excluded from Outstanding Claims | 1,400,000,000 | |||||||||||||||||||||||||||||||
| Cash Settlements [Abstract] | ||||||||||||||||||||||||||||||||
| Payments For Loan Guarantees | 19,000,000 | 16,000,000 | 48,000,000 | 41,000,000 | 4,000,000 | 6,000,000 | 11,000,000 | 6,000,000 | 15,000,000 | 10,000,000 | 37,000,000 | 35,000,000 | ||||||||||||||||||||
| Repurchase claims resolved | 22,000,000 | [1] | 26,000,000 | [1] | 53,000,000 | [1] | 51,000,000 | [1] | ||||||||||||||||||||||||
| Loss On Loan Guarantees | 16,000,000 | 11,000,000 | 39,000,000 | 36,000,000 | ||||||||||||||||||||||||||||
| Liability for Representations and Warranties [Roll Forward] | ||||||||||||||||||||||||||||||||
| Balance, beginning of period | 1,991,000,000 | 2,847,000,000 | 2,847,000,000 | 2,847,000,000 | 213,000,000 | 2,847,000,000 | ||||||||||||||||||||||||||
| Charge-offs | (29,000,000) | (17,000,000) | (56,000,000) | (102,000,000) | ||||||||||||||||||||||||||||
| Provision | 60,000,000 | 17,000,000 | 2,700,000,000 | (769,000,000) | 2,736,000,000 | |||||||||||||||||||||||||||
| Balance, end of period | 2,022,000,000 | 2,847,000,000 | 2,847,000,000 | 2,022,000,000 | 2,847,000,000 | 2,847,000,000 | ||||||||||||||||||||||||||
| Representations, warranties and guarantees, maximum exposure over existing accruals | 1,200,000,000 | |||||||||||||||||||||||||||||||
| Increase to representations, warranties and guarantees maximum exposure above existing accruals | 700,000,000 | |||||||||||||||||||||||||||||||
| Private Label Securitization Trust Related Repurchase Claims | $ 4,344,000,000 | |||||||||||||||||||||||||||||||
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