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Derivative and Other Financial Instruments - Offsetting of Derivative Assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Gross Amounts Recognized in the Balance Sheet, Derivative Assets $ 144 $ 76
Gross Amounts Not Offset in the Balance Sheet, Derivative Assets 32 11
Net Amount, Derivative Assets 112 65
Gross Amounts Recognized in the Balance Sheet, Derivative Liabilities 64 52
Gross Amounts Not Offset in the Balance Sheet, Derivative Liabilities 32 11
Net Amount, Derivative Liabilities $ 32 $ 41