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Investments (Repurchase Agreements - Securities Lending) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Securities Financing Transaction [Line Items]    
Cash collateral on deposit from counterparties $ 32,119 $ 30,197
Reinvestment portfolio — estimated fair value 32,454 30,258
Repurchase Agreements [Member]    
Securities Financing Transaction [Line Items]    
Cash collateral on deposit from counterparties 101 50
Reinvestment portfolio — estimated fair value 99 50
Repurchase Agreements [Member] | Amortized cost    
Securities Financing Transaction [Line Items]    
Securities Sold under Agreements to Repurchase 91 51
Repurchase Agreements [Member] | Estimated fair value    
Securities Financing Transaction [Line Items]    
Securities Sold under Agreements to Repurchase $ 109 $ 56