Derivatives - Financial Statement Presentation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 1,472		$ 1,472		$ 785
Derivative Liability, Fair Value, Gross Liability	(2,192)		(2,192)		(1,189)
Derivative Asset, Fair Value, Gross Liability	(1,246)		(1,246)		(476)
Derivative Liability, Fair Value, Gross Asset	1,456		1,456		772
Derivative Asset	226		226		309
Derivative Liability	(736)		(736)		(417)
Energy Related Derivative | Gain (Loss) on Derivative Instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	16	$ (391)	(491)	$ (441)
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	0	(20)	0	(28)
Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset	1,472		1,472		785
Derivative Liability, Fair Value, Gross Liability	(2,192)		(2,192)		(1,189)
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	(13)	(62)	(145)	(96)
Unrealized Gain (Loss) on Derivatives	29	(309)	(346)	(317)
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	6	1	12	1
Unrealized Gain (Loss) on Derivatives	6	$ 0	17	$ 0
Other Current Liabilities | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset	1,144		1,144		619
Derivative Liability, Fair Value, Gross Liability	(1,475)		(1,475)		(760)
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	328		328		166
Derivative Liability, Fair Value, Gross Liability	$ (717)		$ (717)		$ (429)