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Fair Value of Financial Instruments - Schedule of Fair Value, Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	$ 104						$ 104		$ 123
Derivative Liabilities	330						$ 330		332
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Change in unrealized gains included in earnings for derivatives and other financial instruments held as of September 30, 2024	$ (13)	$ 1	$ (1)	$ 8	$ 3	$ (3)
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Derivative instruments			Derivative instruments			Derivative instruments	Derivative instruments
El Segundo, Marsh Landing and Walnut Creek Notes \| Call Option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of long term debt	$ 326						$ 326		325
Fair value of short term debt	0						0		5
Fair Value, Recurring
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	(381)		$ (317)	$ (291)		$ (336)	(317)	$ (336)
Settlements	6			21			0	30
Total gains (losses) for the period included in earnings	66			(39)			8	(3)
Ending balance	(309)	$ (381)		(309)	$ (291)		(309)	(309)
Change in unrealized gains included in earnings for derivatives and other financial instruments held as of September 30, 2024	66						8
Level 2 \| Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	97						97		123
Derivative Liabilities	4						4		2
Level 3 \| Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	17						17		13
Derivative Liabilities	326						326		330
Energy-related commodity contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	7						7		2
Derivative Liabilities	327						327		330
Energy-related commodity contracts \| Level 2 \| Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	0						0		2
Derivative Liabilities	1						1		0
Energy-related commodity contracts \| Level 3 \| Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	7						7		0
Derivative Liabilities	326						326		330
Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	97						97		121
Derivative Liabilities	3						3		2
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Change in unrealized gains included in earnings for derivatives and other financial instruments held as of September 30, 2024	(57)			$ 33			(33)	$ 34
Interest rate contracts \| Level 2 \| Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	97						97		121
Derivative Liabilities	3						3		2
Interest rate contracts \| Level 3 \| Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	0						0		0
Derivative Liabilities	0						0		0
Other Financial Instruments \| Level 2 \| Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	0						0		0
Other Financial Instruments \| Level 3 \| Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	$ 10						$ 10		$ 13