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Concentrations of Credit Risk Estimated Benefit from Mortgage Insurers (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Risks and Uncertainties [Abstract]    
Contractual mortgage insurance benefit $ 6,751 $ 9,993
Less: Collectability adjustment 431 [1] 708 [1]
Estimated benefit included in total loss reserves $ 6,320 $ 9,285
[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.