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Financial Instruments - Information on Derivative Positions Subject to Master Netting Arrangements as if they were Presented on a Net Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Gross amounts recognized in the consolidated balance sheet, asset $ 340 $ 995
Gross amount subject to offset in master netting arrangements not offset in the consolidated balance sheet, asset (132) (131)
Cash collateral received, asset (65) (529)
Net amounts, asset 143 335
Gross amounts recognized in the consolidated balance sheet, liability 201 134
Gross amount subject to offset in master netting arrangements not offset in the consolidated balance sheet, liability (132) (131)
Cash collateral received, liability 0 0
Net amounts, liability $ 69 $ 3