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Derivatives (Effect of Commodity Derivative Instruments in Statements of Income) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Derivative Instruments, Gain (Loss) [Line Items] |  |
Unrealized Gain (Loss) on Derivatives | $ 318 | $ 16
Commodity derivatives |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) | (909) | (65)
Commodity derivatives | Sales and other operating revenues |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) | (62) | 0
Unrealized Gain (Loss) on Derivatives | (49) | 0
Realized Gain (Loss), Investment and Derivative, Operating, before Tax | (13) | 0
Commodity derivatives | Cost of revenues |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) | (840) | (67)
Unrealized Gain (Loss) on Derivatives | (440) | (13)
Realized Gain (Loss), Investment and Derivative, Operating, before Tax | (400) | (54)
Commodity derivatives | Other income |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) | (7) | 2
Unrealized Gain (Loss) on Derivatives | (30) | (1)
Realized Gain (Loss), Investment and Derivative, Operating, before Tax | $ 23 | $ 3

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- Definition Line items represent financial concepts included in a table. 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