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Commitments, Contingencies and Guarantees - Outstanding Claims (Details) (USD $)
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3 Months Ended | 6 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | |||||||||||||||||||||||||
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Jun. 30, 2012
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Mar. 31, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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Dec. 31, 2011
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Jun. 30, 2012
Minimum [Member]
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Jun. 30, 2012
Maximum [Member]
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Jun. 30, 2012
Repurchases
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Jun. 30, 2011
Repurchases
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Jun. 30, 2012
Repurchases
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Jun. 30, 2011
Repurchases
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Jun. 30, 2012
Indemnification payments
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Jun. 30, 2011
Indemnification payments
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Jun. 30, 2012
Indemnification payments
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Jun. 30, 2011
Indemnification payments
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Jun. 30, 2012
GSEs
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Dec. 31, 2011
GSEs
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Jun. 30, 2012
Non-GSEs
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Jun. 30, 2011
Non-GSEs
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Jun. 30, 2012
Monoline
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Dec. 31, 2011
Monoline
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Jun. 30, 2012
Whole-loan Investors and private-label securitization trustees and other
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Jun. 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 | $ 2,200,000,000 | $ 2,500,000,000 | $ 665,000,000 | |||||||||||||||||||||||||||||||||
| Outstanding Claims By Counterparty | 3,839,000,000 | 3,839,000,000 | 1,302,000,000 | 62,000,000 | 65,000,000 | 147,000,000 | 136,000,000 | 3,630,000,000 | [1] | 3,630,000,000 | [1] | 1,101,000,000 | [1] | |||||||||||||||||||||||
| Claims Outstanding Without a Valid Defect | 2,400,000,000 | 2,400,000,000 | 2,200,000,000 | 2,200,000,000 | ||||||||||||||||||||||||||||||||
| Outstanding Claims in Review Process | 1,400,000,000 | 1,400,000,000 | 1,400,000,000 | 1,400,000,000 | ||||||||||||||||||||||||||||||||
| 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 | 18,000,000 | 23,000,000 | 29,000,000 | 25,000,000 | 7,000,000 | 0 | 7,000,000 | 0 | 11,000,000 | 23,000,000 | 22,000,000 | 25,000,000 | ||||||||||||||||||||||||
| Repurchase claims resolved | 20,000,000 | [2] | 22,000,000 | [2] | 31,000,000 | [2] | 25,000,000 | [2] | ||||||||||||||||||||||||||||
| Loss On Loan Guarantees | 12,000,000 | 23,000,000 | 23,000,000 | 25,000,000 | ||||||||||||||||||||||||||||||||
| Liability for Representations and Warranties [Roll Forward] | ||||||||||||||||||||||||||||||||||||
| Balance, beginning of period | 2,847,000,000 | 2,847,000,000 | 130,000,000 | 2,847,000,000 | 213,000,000 | 2,847,000,000 | ||||||||||||||||||||||||||||||
| Charge-offs | (16,000,000) | (24,000,000) | (27,000,000) | (85,000,000) | ||||||||||||||||||||||||||||||||
| Provision | (840,000,000) | 2,741,000,000 | (829,000,000) | 2,719,000,000 | ||||||||||||||||||||||||||||||||
| Balance, end of period | 1,991,000,000 | 2,847,000,000 | 2,847,000,000 | 1,991,000,000 | 2,847,000,000 | 2,847,000,000 | ||||||||||||||||||||||||||||||
| Representations, warranties and guarantees, maximum exposure over existing accruals | 1,100,000,000 | |||||||||||||||||||||||||||||||||||
| Increase to representations, warranties and guarantees maximum exposure above existing accruals | 600,000,000 | |||||||||||||||||||||||||||||||||||
| Percentage of the voting rights of outstanding securities required to investigate loans files and demand repurchase of loans | 25.00% | |||||||||||||||||||||||||||||||||||
| Private Label Securitization Trust Related Repurchase Claims | $ 3,600,000,000 | |||||||||||||||||||||||||||||||||||
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