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
Mar. 31, 2012
Dec. 31, 2011
Guarantor Obligations [Line Items]    
Outstanding Claims By Counterparty $ 16,094,000,000 [1],[2] $ 12,607,000,000 [1],[2]
Outstanding Claims By Product Type 16,094,000,000 [1],[2] 12,607,000,000 [1],[2]
Table Details [Abstract]    
Outstanding Claims, From Mortgage Insurance Recission Notices 1,400,000,000 1,200,000,000
Repurchase Demands Excluded from Outstanding Claims 3,100,000,000 1,700,000,000
Repurchase Demands Received Excluded from Outstanding Claims 1,400,000,000  
GSEs [Member]
    
Guarantor Obligations [Line Items]    
Outstanding Claims By Counterparty 8,103,000,000 [1],[2] 6,258,000,000 [1],[2]
Monoline [Member]
    
Guarantor Obligations [Line Items]    
Outstanding Claims By Counterparty 3,136,000,000 [1],[2] 3,082,000,000 [1],[2]
Whole loan sale, private-label securitizations and other [Member]
    
Guarantor Obligations [Line Items]    
Outstanding Claims By Counterparty 4,855,000,000 [1],[2] 3,267,000,000 [1],[2]
Prime loans [Member]
    
Guarantor Obligations [Line Items]    
Outstanding Claims By Product Type 4,996,000,000 [1],[2] 3,925,000,000 [1],[2]
Alt [Member]
    
Guarantor Obligations [Line Items]    
Outstanding Claims By Product Type 3,009,000,000 [1],[2] 2,286,000,000 [1],[2]
Home Equity [Member]
    
Guarantor Obligations [Line Items]    
Outstanding Claims By Product Type 2,932,000,000 [1],[2] 2,872,000,000 [1],[2]
Pay option [Member]
    
Guarantor Obligations [Line Items]    
Outstanding Claims By Product Type 3,343,000,000 [1],[2] 1,993,000,000 [1],[2]
Subprime [Member]
    
Guarantor Obligations [Line Items]    
Outstanding Claims By Product Type 1,028,000,000 [1],[2] 891,000,000 [1],[2]
Other Product Type [Member]
    
Guarantor Obligations [Line Items]    
Outstanding Claims By Product Type $ 786,000,000 [1],[2] $ 640,000,000 [1],[2]
[1] At March 31, 2012 and December 31, 2011, outstanding claims did not include repurchase demands of $3.1 billion and $1.7 billion where the Corporation believes the claimants have not satisfied the contractual thresholds as noted below.
[2] Excludes certain MI rescission notices. However, at March 31, 2012 and December 31, 2011, included $1.4 billion and $1.2 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.