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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
Sep. 30, 2018
Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Gross amounts recognized in the consolidated balance sheet, asset $ 387 $ 130
Gross amount subject to offset in master netting arrangements not offset in the consolidated balance sheet, asset (135) (94)
Cash collateral received, asset (54) (3)
Net amounts, asset 198 33
Gross amounts recognized in the consolidated balance sheet, liability 204 217
Gross amount subject to offset in master netting arrangements not offset in the consolidated balance sheet, liability (135) (94)
Cash collateral received, liability 0 0
Net amounts, liability $ 69 $ 123