Derivatives - Financial Statement Presentation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Liability	$ (511)		$ (1,034)
Derivative Liability, Fair Value, Gross Asset	631		1,236
Derivative Asset	256		334
Derivative Liability	(453)		(776)
Energy Related Derivative | Gain (Loss) on Derivative Instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	506	$ (194)
Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset	767		1,368
Derivative Liability, Fair Value, Gross Liability	(1,084)		(2,012)
Not Designated as Hedging Instrument [Member] | Energy Related Derivative | Gain (Loss) on Derivative Instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	174	(69)
Unrealized Gain (Loss) on Derivatives	332	(125)
Not Designated as Hedging Instrument [Member] | Energy Related Derivative | Cost of Sales
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(4)	1
Unrealized Gain (Loss) on Derivatives	(5)	$ 2
Other Current Liabilities | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset	611		1,099
Derivative Liability, Fair Value, Gross Liability	(623)		(1,278)
Regulatory liabilities, deferred income, and other [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset	156		269
Derivative Liability, Fair Value, Gross Liability	$ (461)		$ (734)