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Financial and Derivative Instruments - Effect of Netting Derivative Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Not Designated
Offsetting Assets [Abstract]
Derivative Assets, Gross Amount Recognized	$ 3,537	$ 818
Derivative Assets, Gross Amounts Offset	3,043	744
Derivative Assets, Net Amounts Presented	494	74
Derivative Assets, Gross Amounts Not Offset	0	0
Derivative Assets, Net Amounts Presented	494	74
Offsetting Liabilities [Abstract]
Derivative Liabilities, Gross Amount Recognized	3,324	917
Derivative Liabilities, Gross Amounts Offset	3,043	744
Derivative Liabilities, Net Amounts Presented	281	173
Derivative Liabilities, Gross Amounts Not Offset	0	0
Derivative Liabilities, Net Amounts Presented	281	$ 173
Designated
Offsetting Liabilities [Abstract]
Derivative Liabilities, Gross Amount Recognized	4
Derivative Liabilities, Gross Amounts Offset	0
Derivative Liabilities, Net Amounts Presented	4
Derivative Liabilities, Gross Amounts Not Offset	0
Derivative Liabilities, Net Amounts Presented	$ 4

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