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

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