Derivatives - Financial Statement Presentation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Liability	$ (484)		$ (484)		$ (1,034)
Derivative Liability, Fair Value, Gross Asset	567		567		1,236
Derivative Asset	258		258		334
Derivative Liability	(403)		(403)		(776)
Energy Related Derivative | Gain (Loss) on Derivative Instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	115	$ (313)	621	$ (507)
Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset	742		742		1,368
Derivative Liability, Fair Value, Gross Liability	(970)		(970)		(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	3	(63)	177	(132)
Unrealized Gain (Loss) on Derivatives	112	(250)	444	(375)
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	1	5	(3)	6
Unrealized Gain (Loss) on Derivatives	(29)	$ 9	(34)	$ 11
Other Current Liabilities | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset	486		486		1,099
Derivative Liability, Fair Value, Gross Liability	(661)		(661)		(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	256		256		269
Derivative Liability, Fair Value, Gross Liability	$ (309)		$ (309)		$ (734)