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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 | 3 Months Ended | 3 Months Ended | 6 Months Ended | 6 Months Ended | 3 Months Ended | |||||||||||||||||||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2012
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Jun. 30, 2013
Minimum [Member]
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Jun. 30, 2013
Maximum [Member]
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Jun. 30, 2013
Repurchases
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Jun. 30, 2012
Repurchases
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Jun. 30, 2013
Repurchases
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Jun. 30, 2012
Repurchases
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Jun. 30, 2013
Indemnification payments
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Jun. 30, 2012
Indemnification payments
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Jun. 30, 2013
Indemnification payments
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Jun. 30, 2012
Indemnification payments
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Jun. 30, 2013
Prudential Litigation [Member]
claim
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Jun. 30, 2013
GSEs
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Dec. 31, 2012
GSEs
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Mar. 31, 2013
Non-GSEs
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Jun. 30, 2013
Non-GSEs
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Jun. 30, 2013
Monoline
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Dec. 31, 2012
Monoline
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Jun. 30, 2013
Whole-loan Investors and private-label securitization trustees and other
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Dec. 31, 2012
Whole-loan Investors and private-label securitization trustees and other
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Jun. 30, 2013
Private label securitization trustees
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| Loss Contingencies [Line Items] | |||||||||||||||||||||||||||||||
| Number of MBS claims | 54 | ||||||||||||||||||||||||||||||
| Minimum fee commitments | $ 1,100,000,000 | $ 1,100,000,000 | $ 1,200,000,000 | ||||||||||||||||||||||||||||
| Outstanding Claims [Abstract] | |||||||||||||||||||||||||||||||
| New repurchase claims | 641,000,000 | 28,000,000 | 613,000,000 | ||||||||||||||||||||||||||||
| Outstanding Claims By Counterparty | 7,419,000,000 | 7,419,000,000 | 6,045,000,000 | 46,000,000 | 93,000,000 | 146,000,000 | 147,000,000 | 7,227,000,000 | 5,805,000,000 | ||||||||||||||||||||||
| Claims Outstanding Without a Valid Defect | 7,083,000,000 | 7,083,000,000 | 6,900,000,000 | ||||||||||||||||||||||||||||
| Outstanding Claims in Review Process | 300,000,000 | 300,000,000 | 330,000,000 | ||||||||||||||||||||||||||||
| 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 | 1,200,000,000 | ||||||||||||||||||||||||||||||
| Cash Settlements [Abstract] | |||||||||||||||||||||||||||||||
| Payments For Loan Guarantees | 70,000,000 | 18,000,000 | 91,000,000 | 29,000,000 | 10,000,000 | 7,000,000 | 13,000,000 | 7,000,000 | 60,000,000 | 11,000,000 | 78,000,000 | 22,000,000 | |||||||||||||||||||
| Repurchase claims resolved | 71,000,000 | [1] | 20,000,000 | [1] | 87,000,000 | [1] | 31,000,000 | [1] | |||||||||||||||||||||||
| Loss On Loan Guarantees | 61,000,000 | 12,000,000 | 79,000,000 | 23,000,000 | |||||||||||||||||||||||||||
| Liability for Representations and Warranties [Roll Forward] | |||||||||||||||||||||||||||||||
| Balance, beginning of period | 2,008,000,000 | 2,847,000,000 | 2,011,000,000 | 2,847,000,000 | |||||||||||||||||||||||||||
| Provision | (4,000,000) | (840,000,000) | 11,000,000 | (829,000,000) | |||||||||||||||||||||||||||
| Charge-offs | (63,000,000) | (16,000,000) | (81,000,000) | (27,000,000) | |||||||||||||||||||||||||||
| Balance, end of period | 1,941,000,000 | 1,991,000,000 | 1,941,000,000 | 1,991,000,000 | |||||||||||||||||||||||||||
| Representations, warranties and guarantees, maximum exposure over existing accruals | 1,100,000,000 | 1,100,000,000 | |||||||||||||||||||||||||||||
| Private Label Securitization Trust Related Repurchase Claims | $ 7,200,000,000 | ||||||||||||||||||||||||||||||
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