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Financial and Derivative Instruments - Effect of Netting Derivative Assets and Liabilities (Details) - Not Designated - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Offsetting Assets [Abstract]
Derivative Assets, Gross Amount Recognized	$ 1,186	$ 818
Derivative Assets, Gross Amounts Offset	1,135	744
Derivative Assets, Net Amounts Presented	51	74
Derivative Assets, Gross Amounts Not Offset	0	0
Derivative Assets, Net Amounts Presented	51	74
Offsetting Liabilities [Abstract]
Derivative Liabilities, Gross Amount Recognized	1,268	917
Derivative Liabilities, Gross Amounts Offset	1,135	744
Derivative Liabilities, Net Amounts Presented	133	173
Derivative Liabilities, Gross Amounts Not Offset	0	0
Derivative Liabilities, Net Amounts Presented	$ 133	$ 173

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