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Financial and Derivative Instruments - Effect of Netting Derivative Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Offsetting Assets [Abstract]
Derivative Asset, Gross Amount Recognized	$ 818	$ 656
Derivative Asset, Gross Amounts Offset	744	645
Derivative Asset, Net Amounts Presented	74	11
Derivative Asset, Gross Amounts Not Offset	0	0
Derivative Asset, Net Amount	74	11
Offsetting Liabilities [Abstract]
Derivative Liability, Gross Amount Recognized	917	719
Derivative Liability, Gross Amounts Offset	744	645
Derivative Liability, Net Amounts Presented	173	74
Derivative Liability, Gross Amounts Not Offset	0	0
Derivative Liability, Net Amount	$ 173	$ 74

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