Hedging Activities and Fair Value Measurements - Schedule of Gains and Losses on Derivative Instruments and Related Hedged Items (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Derivatives not designated as hedging instruments:
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	$ 71	$ (5)	$ 48	$ 7
Commodity Derivative Instruments | Revenue | Derivatives not designated as hedging instruments:
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	68	(5)	47	8
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	3	0	1	(1)
Fair value hedge
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	3	0	4	1
Gain (Loss) Recognized in Income on Hedged Item	(2)	1	(2)	5
Fair value hedge | Commodity Derivative Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	$ 3	$ 0	$ 4	$ 1
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Revenues	Revenues	Revenues	Revenues
Fair value hedge | Commodity Derivative Instruments | Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Hedged Item	$ (2)	$ 1	$ (2)	$ 5
Cash flow hedge
Derivative Instruments, Gain (Loss) [Line Items]
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative	12	79	36	(81)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income	61	46	36	50
Cash flow hedge | Interest Rate Derivative Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative	12	0	14	2
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	2	1	3	3
Cash flow hedge | Commodity Derivative Instruments | Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative	19	74	37	(75)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income	67	61	53	80
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	(19)	5	(15)	(8)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income	$ (8)	$ (16)	$ (20)	$ (33)