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Derivative and Other Financial Instruments - Offsetting of Derivative Assets and Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Gross Amounts Recognized in the Balance Sheet, Derivative Assets $ 66 $ 47
Gross Amounts Not Offset in the Balance Sheet, Derivative Assets 17 19
Net Amount, Derivative Assets 49 28
Gross Amounts Recognized in the Balance Sheet, Derivative Liabilities 45 59
Gross Amounts Not Offset in the Balance Sheet, Derivative Liabilities 17 19
Net Amount, Derivative Liabilities $ 28 $ 40