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Financial and Derivative Instruments - Effect of Netting Derivative Assets and Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Not Designated |  |
Offsetting Assets [Abstract] |  |
Derivative Assets, Gross Amount Recognized | $ 1,761 | $ 818
Derivative Assets, Gross Amounts Offset | 1,639 | 744
Derivative Assets, Net Amounts Presented | 122 | 74
Derivative Assets, Gross Amounts Not Offset | 0 | 0
Derivative Assets, Net Amounts Presented | 122 | 74
Offsetting Liabilities [Abstract] |  |
Derivative Liabilities, Gross Amount Recognized | 1,869 | 917
Derivative Liabilities, Gross Amounts Offset | 1,639 | 744
Derivative Liabilities, Net Amounts Presented | 230 | 173
Derivative Liabilities, Gross Amounts Not Offset | 1 | 0
Derivative Liabilities, Net Amounts Presented | 229 | $ 173
Designated |  |
Offsetting Liabilities [Abstract] |  |
Derivative Liabilities, Gross Amount Recognized | 2 |
Derivative Liabilities, Gross Amounts Offset | 0 |
Derivative Liabilities, Net Amounts Presented | 2 |
Derivative Liabilities, Gross Amounts Not Offset | 0 |
Derivative Liabilities, Net Amounts Presented | $ 2 |

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