Commodity Derivatives - Financial Statement Presentation (Details) - Energy Related Derivative - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Liability	$ (380)		$ (552)
Derivative Liability, Fair Value, Gross Asset	450		554
Derivative Asset	231		314
Derivative Liability	(233)		(287)
Gain (Loss) on Derivative Instruments, Net, Pretax	(10)	$ 497
Gain (Loss) on Derivative Instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	(9)	506
Cost of Sales
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	(1)	(9)
Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset	611		866
Derivative Liability, Fair Value, Gross Liability	(683)		(841)
Not Designated as Hedging Instrument [Member] | Gain (Loss) on Derivative Instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized	86	174
Unrealized	(95)	332
Not Designated as Hedging Instrument [Member] | Cost of Sales
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized	(4)	(4)
Unrealized	3	$ (5)
Derivative assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset	438		623
Regulatory assets, deferred charges, and other [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset	173		243
Derivative Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Liability, Fair Value, Gross Liability	(406)		(496)
Regulatory liabilities, deferred income, and other [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ (277)		$ (345)