Goodwill and Other Intangibles - Components of Intangible Assets Subject to Amortization (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	$ 4,147	$ 2,025
Purchases	430	348
Acquisition of businesses	55	2,352
Usage/Sales/Retirements	(374)	(365)
Write-off of fully amortized balances	(14)	(216)
Other	0	3
Balance at end of period	4,244	4,147
Less accumulated amortization	(2,112)	(1,636)
Net carrying amount	2,132	2,511
Renewables Energy Certificates
Finite-lived Intangible Assets [Roll Forward]
Carrying value	186	123
Emission Allowances
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	634	672
Purchases	26	10
Acquisition of businesses	0	0
Usage/Sales/Retirements	(33)	(1)
Write-off of fully amortized balances	(14)	(51)
Other	11	4
Balance at end of period	624	634
Less accumulated amortization	(528)	(536)
Net carrying amount	96	98
Customer and Supply Contracts
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	638	28
Purchases	0	0
Acquisition of businesses	0	610
Usage/Sales/Retirements	0	0
Write-off of fully amortized balances	0	0
Other	(3)	0
Balance at end of period	635	638
Less accumulated amortization	(235)	(94)
Net carrying amount	400	544
Customer Relationships
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	1,679	527
Purchases	0	0
Acquisition of businesses	55	1,308
Usage/Sales/Retirements	0	0
Write-off of fully amortized balances	0	(158)
Other	(4)	2
Balance at end of period	1,730	1,679
Less accumulated amortization	(787)	(518)
Net carrying amount	$ 943	$ 1,161
Weighted average useful life, years	6 years	12 years
Marketing Partnerships
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	$ 284	$ 285
Purchases	0	0
Acquisition of businesses	0	0
Usage/Sales/Retirements	0	0
Write-off of fully amortized balances	0	0
Other	0	(1)
Balance at end of period	284	284
Less accumulated amortization	(146)	(123)
Net carrying amount	138	161
Trade Names
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	683	373
Purchases	0	0
Acquisition of businesses	0	310
Usage/Sales/Retirements	0	0
Write-off of fully amortized balances	0	0
Other	(4)	0
Balance at end of period	679	683
Less accumulated amortization	(341)	(294)
Net carrying amount	338	389
Other
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	229	140
Purchases	404	338
Acquisition of businesses	0	124
Usage/Sales/Retirements	(341)	(364)
Write-off of fully amortized balances	0	(7)
Other	0	(2)
Balance at end of period	292	229
Less accumulated amortization	(75)	(71)
Net carrying amount	$ 217	$ 158