Quarterly report pursuant to Section 13 or 15(d)

Representations and Warranties Obligations and Corporate Guarantees - Outstanding Claims (Details)

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Representations and Warranties Obligations and Corporate Guarantees - Outstanding Claims (Details) (USD $)
 3 Months Ended 3 Months Ended 1 Months Ended
Mar. 31, 2013
RescissionNotices
Mar. 31, 2012
Dec. 31, 2012
RescissionNotices
Mar. 31, 2013
Prime loans [Member]
Dec. 31, 2012
Prime loans [Member]
Mar. 31, 2013
Alt [Member]
Dec. 31, 2012
Alt [Member]
Mar. 31, 2013
Home Equity [Member]
Dec. 31, 2012
Home Equity [Member]
Mar. 31, 2013
Pay option [Member]
Dec. 31, 2012
Pay option [Member]
Mar. 31, 2013
Subprime [Member]
Dec. 31, 2012
Subprime [Member]
Mar. 31, 2013
Other Product Type [Member]
Dec. 31, 2012
Other Product Type [Member]
Mar. 31, 2013
Government Sponsored Entities [Member]
Dec. 31, 2012
Government Sponsored Entities [Member]
Mar. 31, 2013
Monoline [Member]
Dec. 31, 2012
Monoline [Member]
Mar. 31, 2013
Whole loan sale, private-label securitizations and other [Member]
Dec. 31, 2012
Whole loan sale, private-label securitizations and other [Member]
Mar. 31, 2013
Government Sponsored Entities [Member]
Mar. 31, 2013
Whole loan sale, private-label securitizations and other [Member]
Mar. 31, 2013
Monoline [Member]
Mar. 31, 2013
Other Non Government Sponsored Entites [Member]
Mar. 31, 2013
Whole-Loan Investors [Member]
Mar. 31, 2013
Maximum [Member]
Mar. 31, 2013
Minimum [Member]
Jan. 06, 2013
Federal National Mortgage Association FNMA [Member]
Mar. 31, 2013
First Lien Mortgages Serviced for Others [Member]
RescissionNotices
Mar. 31, 2013
Loans held for investment [Member]
RescissionNotices
Mar. 31, 2013
Implicated by Ongoing Litigation [Member]
RescissionNotices
Jan. 31, 2013
Federal National Mortgage Association FNMA [Member]
Mar. 31, 2013
Federal National Mortgage Association FNMA [Member]
First Lien Mortgages Serviced for Others [Member]
RescissionNotices
Mar. 31, 2013
Prior to 2009 [Member]
Government Sponsored Entities [Member]
Mar. 31, 2013
After 2008 [Member]
Government Sponsored Entities [Member]
Guarantor Obligations [Line Items]                                                                        
Payments for Legal Settlements $ 100,000,000 $ 100,000,000                                                             $ 3,600,000,000      
Timeframe To Resolve Repurchase Claims In Dispute                                                     120 days 90 days                
Outstanding Claims By Counterparty 17,135,000,000 [1],[2]   28,278,000,000 [1],[2]                         1,138,000,000 [1],[2] 13,530,000,000 [1],[2] 2,488,000,000 [1],[2],[3] 2,449,000,000 [1],[2] 13,509,000,000 [1],[2] 12,299,000,000 [1],[2]                              
Timetable to reach a settlement once a breach of representations and warranties is confirmed                                                     90 days 60 days                
Outstanding Claims By Product Type 17,135,000,000 [1],[2]   28,278,000,000 [1],[2] 1,359,000,000 [1],[2] 8,793,000,000 [1],[2] 1,034,000,000 [1],[2] 5,428,000,000 [1],[2] 2,467,000,000 [1],[2] 2,394,000,000 [1],[2] 5,594,000,000 [1],[2] 5,884,000,000 [1],[2] 4,533,000,000 [1],[2] 3,687,000,000 [1],[2] 2,148,000,000 [1],[2] 2,092,000,000 [1],[2]                                          
Outstanding Claims, From Mortgage Insurance Recission Notices 400,000,000   2,300,000,000                                                   1,900,000,000              
Repurchase Demands under Review                                                 900,000,000                   200,000,000 0
New Purchase Claims 1,800,000,000                                         400,000,000   42,000,000 1,300,000,000 100,000,000                    
Amount of Loan Repurchase Claims Resolved 13,000,000,000                                                                      
Amount of Loan Repurchase Claims Resolved Through Rescission 400,000,000                                                                      
Amount of Loan Repurchase Claims Resolved Through Repurchase and Make Whole Payments 311,000,000                                                                      
Outstanding Claims For Representations And Warranties Unpaid Principal Balance                                                 13,300,000,000                   861,000,000 277,000,000
Repurchase Demands Excluded from Outstanding Claims 1,600,000,000                                               12,400,000,000                   700,000,000 200,000,000
Repurchase Demands Received Excluded from Outstanding Claims $ 300,000,000                                           $ 1,300,000,000                          
Number of Open Mortgage Insurance Rescission Notices 109,000   110,000                                                     48,000 11,000 50,000   26,000    
[1] Excludes certain MI rescission notices. However, at March 31, 2013 and December 31, 2012, included $427 million and $2.3 billion of repurchase requests received from the GSEs that have resulted solely from MI rescission notices. For additional information, see Mortgage Insurance Rescission Notices in this Note.
[2] At both March 31, 2013 and December 31, 2012, unresolved repurchase claims did not include repurchase demands of $1.6 billion where the Corporation believes the claimants have not satisfied the contractual thresholds as noted on page 189.
[3] (3) As a result of the MBIA Settlement, $945 million of monoline repurchase claims outstanding at March 31, 2013 were resolved in May 2013.