Quarterly report pursuant to Section 13 or 15(d)

Representations and Warranties Obligations and Corporate Guarantees - Litigation Settlement (Details)

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Representations and Warranties Obligations and Corporate Guarantees - Litigation Settlement (Details) (USD $)
 3 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Jan. 31, 2013
Federal National Mortgage Association FNMA [Member]
Jan. 06, 2013
Federal National Mortgage Association FNMA [Member]
Dec. 31, 2012
Federal National Mortgage Association FNMA [Member]
Jun. 30, 2013
Subsequent Event [Member]
MBIA Settlement [Member]
Mar. 31, 2013
Subsequent Event [Member]
MBIA Settlement [Member]
Mar. 31, 2013
Second Mortgage [Member]
Subsequent Event [Member]
MBIA Settlement [Member]
trust
Mar. 31, 2013
First Mortgage [Member]
Subsequent Event [Member]
MBIA Settlement [Member]
trust
Guarantor Obligations [Line Items]                  
Number Of Trusts Involved In Settlement Agreement               17 31
Outstanding monoline repurchase claims resolved             $ 945,000,000    
Unpaid principal balance of loans where file requests were received with no repurchase claim             2,600,000,000    
Original Principal Balance Of Loans Originated       1,400,000,000,000     54,800,000,000    
Unpaid Principal Balance             19,200,000,000    
Outstanding Principal Balance of Residential Mortgage Loans Included in Settlement Agreement       300,000,000,000          
Unresolved Repurchase Claims Submitted for Alleged Breaches of Selling Representations and Warranties         12,200,000,000        
Payments for Legal Settlements 100,000,000 100,000,000 3,600,000,000     1,565,000,000      
Notes Issued           95,000,000      
Percentage of outstanding common stock to be purchased           4.90%      
Exercise Price Of Common Stock           $ 9.59      
Line of Credit Facility, Current Borrowing Capacity             500,000,000    
Notional Value of Credit Default Swaps             7,400,000,000    
Market Value of Credit Default Swaps             813,000,000    
Settlement Related Charges             1,648,000,000    
Litigation Settlement, Expense 2,200,000,000 793,000,000         1,348,000,000    
Residental Mortgage Loans Repurchased in Settlement     6,600,000,000            
Original Principal Balance of First Lien Mortgages Included in Settlement Agreement             29,300,000,000    
Original Principal Balance of Second Lien Mortgages Included in Settlement Agreement             25,500,000,000    
Unpaid principal balance of first lien mortgages included in settlement agreement             9,800,000,000    
Unpaid principal balance of second lien mortgages included in settlement agreement             $ 9,400,000,000