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Derivative Financial Instruments Narrative (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Investment Segment    
Derivative [Line Items]    
Fair value derivative instruments with credit risk related contingent features in a liability position $ 17 $ 39
Accrued expenses and other liabilities | Not designated as hedging instrument    
Derivative [Line Items]    
Derivative contracts at fair value (liability) $ 1,673 $ 1,139