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Credit Risk (Details 3) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Credit Risk    
Mortgage loans in foreclosure and related advances $ 32 $ 34
Allowance for probable foreclosure losses (9) (10)
Mortgage loans in foreclosure, net 23 24
Real estate owned and related advances 28 38
Adjustment to value for real estate owned (13) (17)
Real estate owned, net $ 15 $ 21