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Financial Instruments and Risk Management (Unrealized Risk Management Positions) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Derivatives, Fair Value [Line Items]    
Risk Management, Current asset $ 86 $ 108
Risk Management, Long-term asset 4 0
Risk Management, Total asset 90 108
Risk Management, Current liability 2 107
Risk Management, Long-term liability 13 21
Risk Management, Total liability 15 128
Risk Management and Other Derivative Guarantee, at Fair Value, Net $ 75 $ (20)