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Concentrations of Credit Risk Estimated Benefit from Mortgage Insurers (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Risks and Uncertainties [Abstract]    
Contractual mortgage insurance benefit $ 6,400 $ 6,751
Less: Collectability adjustment 409 [1] 431 [1]
Estimated benefit included in total loss reserves $ 5,991 $ 6,320
[1] Represents an adjustment that reduces the contractual benefit for our assessment of our mortgage insurer counterparties’ inability to fully pay the contractual mortgage insurance claims.