Commodity Derivatives - Financial Statement Presentation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 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 Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other Assets, Noncurrent		Other Assets, Noncurrent
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration]	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
Energy Related Derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Liability	$ (540)		$ (382)
Derivative Liability, Fair Value, Gross Asset	824		670
Derivative Asset	254		344
Derivative Liability	(353)		(400)
Gain (Loss) on Derivative Instruments, Net, Pretax	(73)	$ (10)
Energy Related Derivative | Gain (Loss) on Derivative Instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	(62)	(9)
Energy Related Derivative | Cost of Sales
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	(11)	(1)
Not Designated as Hedging Instrument [Member] | Energy Related Derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset	794		726
Derivative Liability, Fair Value, Gross Liability	(1,177)		(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	(40)	86
Unrealized	(22)	(95)
Not Designated as Hedging Instrument [Member] | Energy Related Derivative | Cost of Sales
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized	(1)	(4)
Unrealized	(10)	$ 3
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	558		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	236		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	(732)		(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	$ (445)		$ (435)