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Financial Instruments and Risk Management (Reconciliation of Unrealized Risk Management Positions) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Derivative [Line Items] |  |  |
Fair Value of Contracts, Beginning of Year | $ (20) |  |
Fair Value of Contracts Realized During the Year | (68) | $ (268) | $ 50
Fair Value of Contracts, End of Year | 75 | (20) |
Unrealized Gain (Loss) on Derivatives | 95 | (236) | 215
Commodity Contract [Member] |  |  |
Derivative [Line Items] |  |  |
Increase (Decrease) in Derivative Assets and Liabilities | $ 163 | $ 32 | $ 165

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