Quarterly report pursuant to Section 13 or 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, 2013
Mar. 31, 2012
Dec. 31, 2012
Outstanding Claims [Abstract]      
New repurchase claims $ 1,075,000,000    
Outstanding Claims By Counterparty 7,053,000,000   6,045,000,000
Claims Outstanding Without a Valid Defect 6,304,000,000    
Outstanding Claims in Review Process 758,000,000    
Inactive Claims, Threshold Period of Inactivity after Denial     6 months
Repurchase Demands Received Excluded from Outstanding Claims 1,300,000,000    
Cash Settlements [Abstract]      
Payments For Loan Guarantees 21,000,000 11,000,000  
Repurchase claims resolved 16,000,000 [1] 11,000,000 [1]  
Loss On Loan Guarantees 18,000,000 11,000,000  
Liability for Representations and Warranties [Roll Forward]      
Balance, beginning of period 2,011,000,000 2,847,000,000 2,847,000,000
Charge-offs (18,000,000) (11,000,000)  
Provision 15,000,000 11,000,000  
Balance, end of period 2,008,000,000 2,847,000,000 2,011,000,000
Minimum [Member]
      
Outstanding Claims [Abstract]      
Timeframe To Resolve Repurchase Claims In Dispute     60 days
Maximum [Member]
      
Outstanding Claims [Abstract]      
Timeframe To Resolve Repurchase Claims In Dispute     90 days
Repurchases
      
Cash Settlements [Abstract]      
Payments For Loan Guarantees 3,000,000 0  
Indemnification payments
      
Cash Settlements [Abstract]      
Payments For Loan Guarantees 18,000,000 11,000,000  
GSEs
      
Outstanding Claims [Abstract]      
New repurchase claims 37,000,000    
Outstanding Claims By Counterparty 100,000,000   93,000,000
Non-GSEs
      
Liability for Representations and Warranties [Roll Forward]      
Representations, warranties and guarantees, maximum exposure over existing accruals 1,100,000,000    
Monoline
      
Outstanding Claims [Abstract]      
Outstanding Claims By Counterparty 147,000,000   147,000,000
Whole-loan Investors and private-label securitization trustees and other
      
Outstanding Claims [Abstract]      
Outstanding Claims By Counterparty 6,806,000,000   5,805,000,000
Claims Outstanding Without a Valid Defect 6,100,000,000    
Outstanding Claims in Review Process 727,000,000    
Liability for Representations and Warranties [Roll Forward]      
Private Label Securitization Trust Related Repurchase Claims 6,800,000,000    
Whole-loan investors
      
Outstanding Claims [Abstract]      
New repurchase claims 1,000,000    
Private label securitization trustees
      
Outstanding Claims [Abstract]      
New repurchase claims $ 1,037,000,000    
[1] Represents unpaid principal balance.