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Price Risk Management Activities, Effect of Derivative Instruments on Income and Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Commodity Contracts [Member] |  |  |
Effect of Derivative Instruments on Income |  |  |
Gain (loss) recognized in other comprehensive income (loss) on derivatives | $ (44) | $ 38 | $ (6)
Commodity Contracts [Member] | Revenues [Member] |  |  |
Effect of Derivative Instruments on Income |  |  |
Gain (loss) reclassified from accumulated other comprehensive loss into income | (46) | 34 | 2
Commodity Contracts [Member] | Revenues [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |
Effect of Derivative Instruments on Income |  |  |
Gain (loss) recognized in income on derivatives | 28 | 0 | 5
Commodity Contracts [Member] | Cost of Materials and Other [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |
Effect of Derivative Instruments on Income |  |  |
Gain (loss) recognized in income on derivatives | (86) | 99 | (68)
Commodity Contracts [Member] | Operating Expenses (Excluding Depreciation and Amortization Expense) [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |
Effect of Derivative Instruments on Income |  |  |
Gain (loss) recognized in income on derivatives | 54 | 2 | 0
Foreign Currency Contracts [Member] | Cost of Materials and Other [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |
Effect of Derivative Instruments on Income |  |  |
Gain (loss) recognized in income on derivatives | 9 | 27 | (21)
Foreign Currency Contracts [Member] | Other Income, Net [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |
Effect of Derivative Instruments on Income |  |  |
Gain (loss) recognized in income on derivatives | $ 44 | $ (13) | $ 75

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