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Derivative and Other Financial Instruments - Offsetting of Derivative Assets and Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Gross Amounts Recognized in the Balance Sheet, Derivative Assets $ 200 $ 83
Gross Amounts Not Offset in the Balance Sheet, Derivative Assets 21 16
Net Amount, Derivative Assets 179 67
Gross Amounts Recognized in the Balance Sheet, Derivative Liabilities 103 49
Gross Amounts Not Offset in the Balance Sheet, Derivative Liabilities 21 16
Net Amount, Derivative Liabilities $ 82 $ 33