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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 ($)
Jun. 30, 2021
Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Gross amounts recognized in the consolidated balance sheet, asset $ 333,000,000 $ 182,000,000
Gross amount subject to offset in master netting arrangements not offset in the condensed balance sheet, asset (152,000,000) (156,000,000)
Cash collateral received, asset (13,000,000) 0
Net amounts, asset 168,000,000 26,000,000
Gross amounts recognized in the consolidated balance sheet, liability 174,000,000 525,000,000
Gross amount subject to offset in master netting arrangements not offset in the condensed balance sheet, liability (152,000,000) (156,000,000)
Cash collateral received, liability 0 (36,000,000)
Net amounts, liability $ 22,000,000 $ 333,000,000