Commodity Derivatives - Financial Statement Presentation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration]	Derivative assets		Derivative assets		Derivative assets
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other Assets, Noncurrent		Other Assets, Noncurrent		Other Assets, Noncurrent
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration]	Derivative Liability, Current		Derivative Liability, Current		Derivative Liability, Current
Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other Liabilities and Deferred Revenue, Noncurrent		Other Liabilities and Deferred Revenue, Noncurrent		Other Liabilities and Deferred Revenue, Noncurrent
Energy Related Derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Liability	$ (344)		$ (344)		$ (382)
Derivative Liability, Fair Value, Gross Asset	613		613		670
Derivative Asset	265		265		344
Derivative Liability	(336)		(336)		(400)
Gain (Loss) on Derivative Instruments, Net, Pretax	47	$ (137)	(26)	$ (147)
Energy Related Derivative | Gain (Loss) on Derivative Instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	36	(129)	(26)	(138)
Energy Related Derivative | Cost of Sales
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	11	(8)	0	(9)
Not Designated as Hedging Instrument [Member] | Energy Related Derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset	609		609		726
Derivative Liability, Fair Value, Gross Liability	(949)		(949)		(1,070)
Not Designated as Hedging Instrument [Member] | Energy Related Derivative | Gain (Loss) on Derivative Instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized	12	(5)	(28)	81
Unrealized	24	(124)	2	(219)
Not Designated as Hedging Instrument [Member] | Energy Related Derivative | Cost of Sales
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized	(1)	(1)	(2)	(5)
Unrealized	12	$ (7)	2	$ (4)
Derivative assets [Member] | Not Designated as Hedging Instrument [Member] | Energy Related Derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset	418		418		508
Regulatory assets, deferred charges, and other [Member] | Not Designated as Hedging Instrument [Member] | Energy Related Derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset	191		191		218
Derivative Liabilities [Member] | Not Designated as Hedging Instrument [Member] | Energy Related Derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Liability, Fair Value, Gross Liability	(528)		(528)		(635)
Regulatory liabilities, deferred income, and other [Member] | Not Designated as Hedging Instrument [Member] | Energy Related Derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ (421)		$ (421)		$ (435)