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Price Risk Management Activities, Effect of Derivative Instruments on Income and Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Commodity Contracts [Member] |  |
Effect of Derivative Instruments on Income |  |
Gain (loss) recognized in other comprehensive income (loss) on derivatives | $ (13) | $ 55
Commodity Contracts [Member] | Revenues [Member] |  |
Effect of Derivative Instruments on Income |  |
Gain (loss) reclassified from accumulated other comprehensive loss into income | (23) | 26
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 | 7 | (8)
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 | (78) | (152)
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 | 1 | (2)
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 | (8) | 49
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 | $ 30 | $ (165)

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