v3.7.0.1
Derivative Instruments and Hedging Activities (Schedule of Offsetting Assets and LIabilities) (Details) - Foreign Exchange Forward [Member] - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Offsetting Assets and Liabilities [Line Items]    
Derivative Asset, Fair Value, Gross Asset $ 120 $ 166
Derivative Asset, Fair Value, Gross Liability 0 0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 120 166
Derivative, Collateral, Obligation to Return Securities (23) (16)
Derivative, Collateral, Obligation to Return Cash 0 0
Derivative Asset, Fair Value, Amount Offset Against Collateral 97 150
Derivative Liability, Fair Value, Gross Liability (23) (16)
Derivative Liability, Fair Value, Gross Asset 0 0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 23 16
Derivative, Collateral, Right to Reclaim Securities 23 16
Derivative, Collateral, Right to Reclaim Cash 0 0
Derivative Liability, Fair Value, Amount Offset Against Collateral $ 0 $ 0