Annual report pursuant to Section 13 and 15(d)

Commitments, Contingencies and Guarantees - Outstanding Claims (Details)

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Commitments, Contingencies and Guarantees - Outstanding Claims (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2012
Jun. 30, 2011
Dec. 31, 2012
Dec. 31, 2011
Outstanding Claims [Abstract]        
Unresolved Repurchase Claims by Counterparty     $ 6,045,000,000 $ 1,302,000,000
New repurchase claims     4,800,000,000  
Claims outstanding without a valid defect     4,922,000,000  
Outstanding claims in review process     1,123,000,000  
Repurchase demands received excluded from outstanding claims 1,300,000,000      
Cash Settlements [Abstract]        
Payments to resolve repurchase claims     73,000,000 58,000,000
Repurchase claims resolved     73,000,000 [1] 62,000,000 [1]
Loss on loan guarantees     62,000,000 48,000,000
Liability for Representations and Warranties [Roll Forward]        
Balance, beginning of period 2,847,000,000   2,847,000,000 213,000,000
Charge-offs     (82,000,000) (97,000,000)
Provision   2,700,000,000 (754,000,000) 2,731,000,000
Balance, end of period     2,011,000,000 2,847,000,000
Inactive Claims, Threshold Period of Inactivity after Denial     6 months  
Minimum
        
Liability for Representations and Warranties [Roll Forward]        
Timeframe To Resolve Repurchase Claims In Dispute     60 days  
Maximum
        
Liability for Representations and Warranties [Roll Forward]        
Timeframe To Resolve Repurchase Claims In Dispute     90 days  
Repurchases
        
Cash Settlements [Abstract]        
Payments to resolve repurchase claims     14,000,000 12,000,000
Indemnification payments
        
Cash Settlements [Abstract]        
Payments to resolve repurchase claims     59,000,000 46,000,000
GSEs
        
Outstanding Claims [Abstract]        
Unresolved Repurchase Claims by Counterparty     93,000,000 65,000,000
New repurchase claims     54,000,000  
Non-GSEs
        
Cash Settlements [Abstract]        
Voting rights per trust, threshold percentage for claim assertion     25.00%  
Voting rights of outstanding tranches, threshold percentage to trigger investigation     25.00%  
Liability for Representations and Warranties [Roll Forward]        
Balance, beginning of period 2,847,000,000   2,847,000,000  
Representations, warranties and guarantees, maximum exposure over existing accruals     1,100,000,000  
Increase (Decrease) to Representations Warranties and Guarantees Maximum Exposure Above Existing Accruals     600,000,000  
Monoline
        
Outstanding Claims [Abstract]        
Unresolved Repurchase Claims by Counterparty     147,000,000 136,000,000
New repurchase claims     17,000,000  
Whole-loan Investors and private-label securitization trustees and other
        
Outstanding Claims [Abstract]        
Unresolved Repurchase Claims by Counterparty     5,805,000,000 1,101,000,000
New repurchase claims     4,700,000,000 665,000,000
Claims outstanding without a valid defect     4,696,000,000  
Outstanding claims in review process     1,109,000,000  
Liability for Representations and Warranties [Roll Forward]        
Notional amount of private label securitization trust related repurchase claims     5,805,000,000  
wholeloan [Member]
        
Outstanding Claims [Abstract]        
New repurchase claims     22,000,000  
Private Label Securitization Trustees [Member]
        
Outstanding Claims [Abstract]        
New repurchase claims     $ 4,700,000,000  
[1] Represents unpaid principal balance.