Commodity Derivatives - Financial Statement Presentation (Details) - Energy Related Derivative - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Liability	$ (552)	$ (1,034)
Derivative Liability, Fair Value, Gross Asset	554	1,236
Derivative Asset	314	334
Derivative Liability	(287)	(776)
Gain (Loss) on Derivative Instruments, Net, Pretax	909	(324)	$ (146)
Gain (Loss) on Derivative Instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	956	(387)	(148)
Cost of Sales
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	(47)	63	2
Designated as Hedging Instrument | Gain (Loss) on Derivative Instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	(55)
Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset	866	1,368
Derivative Liability, Fair Value, Gross Liability	(841)	(2,012)
Not Designated as Hedging Instrument [Member] | Gain (Loss) on Derivative Instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	253	(91)	16
Unrealized Gain (Loss) on Derivatives	703	(296)	(109)
Not Designated as Hedging Instrument [Member] | Cost of Sales
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(4)	16	2
Unrealized Gain (Loss) on Derivatives	(43)	47	$ 0
Derivative assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset	623	1,099
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	243	269
Other Current Liabilities | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Liability, Fair Value, Gross Liability	(496)	(1,278)
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	$ (345)	$ (734)