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Hedging Activities and Fair Value Measurements - Schedule of Gains and Losses on Derivative Instruments and Related Hedged Items (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Derivatives not designated as hedging instruments:      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in Income on Derivative $ 40 $ 22 $ 213
Commodity Derivative Instruments | Revenue | Derivatives not designated as hedging instruments:      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in Income on Derivative 45 26 213
Commodity Derivative Instruments | Operating costs and expenses | Derivatives not designated as hedging instruments:      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in Income on Derivative (5) (4) 0
Fair value hedge      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in Income on Derivative 5 2 7
Gain (Loss) Recognized in Income on Hedged Item (3) 9 (7)
Fair value hedge | Commodity Derivative Instruments      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in Income on Derivative $ 5 $ 2 $ 7
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Revenues Revenues Revenues
Fair value hedge | Commodity Derivative Instruments | Revenue      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in Income on Hedged Item $ (3) $ 9 $ (7)
Cash flow hedge      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative 299 113 57
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income 199 184 115
Cash flow hedge | Commodity Derivative Instruments | Revenue      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative 321 182 81
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income 235 249 106
Cash flow hedge | Commodity Derivative Instruments | Operating costs and expenses      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative (36) (67) 12
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income (43) (71) 4
Cash flow hedge | Interest Rate Derivative Instruments      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative 14 (2) (36)
Cash flow hedge | Interest Rate Derivative Instruments | Interest expense      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income $ 7 $ 6 $ 5