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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 ($)
Mar. 31, 2019
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Gross amounts recognized in the consolidated balance sheet, asset $ 384,000,000 $ 454,000,000
Gross amount subject to offset in master netting arrangements not offset in the consolidated balance sheet, asset (155,000,000) (121,000,000)
Cash collateral received, asset (37,000,000) (107,000,000)
Net amounts, asset 192,000,000 226,000,000
Gross amounts recognized in the consolidated balance sheet, liability 195,000,000 160,000,000
Gross amount subject to offset in master netting arrangements not offset in the consolidated balance sheet, liability (155,000,000) (121,000,000)
Cash collateral received, liability 0 0
Net amounts, liability $ 40,000,000 $ 39,000,000