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Fair Value Measurements - Assets and Liabilities at Fair Value, Recurring (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Not Designated |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |
Derivatives - not designated | $ 494 | $ 74
Derivatives - not designated | 281 | 173
Designated |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |
Derivatives - not designated | 4 |
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |
Total Assets at Fair Value | 16 |
Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |
Marketable Securities | 34 | 31
Total Assets at Fair Value | 528 | 105
Total Liabilities at Fair Value | 285 | 173
Recurring Basis | Not Designated |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |
Derivatives - not designated | 494 | 74
Derivatives - not designated | 281 | 173
Recurring Basis | Designated |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |
Derivatives - not designated | 4 | 0
Recurring Basis | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |
Marketable Securities | 34 | 31
Total Assets at Fair Value | 528 | 68
Total Liabilities at Fair Value | 148 | 58
Recurring Basis | Level 1 | Not Designated |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |
Derivatives - not designated | 494 | 37
Derivatives - not designated | 144 | 58
Recurring Basis | Level 1 | Designated |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |
Derivatives - not designated | 4 | 0
Recurring Basis | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |
Marketable Securities | 0 | 0
Total Assets at Fair Value | 0 | 37
Total Liabilities at Fair Value | 137 | 115
Recurring Basis | Level 2 | Not Designated |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |
Derivatives - not designated | 0 | 37
Derivatives - not designated | 137 | 115
Recurring Basis | Level 2 | Designated |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |
Derivatives - not designated | 0 | 0
Recurring Basis | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |
Marketable Securities | 0 | 0
Total Assets at Fair Value | 0 | 0
Total Liabilities at Fair Value | 0 | 0
Recurring Basis | Level 3 | Not Designated |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |
Derivatives - not designated | 0 | 0
Derivatives - not designated | 0 | 0
Recurring Basis | Level 3 | Designated |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |
Derivatives - not designated | $ 0 | $ 0

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