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Derivative and Other Financial Instruments - Offsetting of Derivative Assets and Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Gross Amounts Recognized in the Balance Sheet, Derivative Assets $ 135 $ 76
Gross Amounts Not Offset in the Balance Sheet, Derivative Assets 22 11
Net Amount, Derivative Assets 113 65
Gross Amounts Recognized in the Balance Sheet, Derivative Liabilities 72 52
Gross Amounts Not Offset in the Balance Sheet, Derivative Liabilities 22 11
Net Amount, Derivative Liabilities $ 50 $ 41