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 6 Months Ended 1 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
MBIA Settlement [Member]
May 07, 2013
MBIA Settlement [Member]
Mar. 31, 2013
MBIA Settlement [Member]
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
Second Mortgage [Member]
MBIA Settlement [Member]
trust
Jun. 30, 2013
First Mortgage [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           54,800,000,000     1,400,000,000,000      
Unpaid Principal Balance           19,100,000,000            
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 1,600,000,000 56,000,000 1,700,000,000 131,000,000 1,565,000,000     3,600,000,000        
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          
Litigation Settlement, Expense 471,000,000 963,000,000 2,700,000,000 1,800,000,000                
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         $ 9,300,000,000