Dispositions - Narrative (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024 USD ($) MWh project	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) MWh project	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Mar. 01, 2023 USD ($) MWh project	Oct. 01, 2022 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Period to obtain consent (in years)	2 years		2 years
Number of solar projects | project	2		2
Clean Energy Businesses | RWE | Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Estimate of possible loss (up to)	$ 172,000,000		$ 172,000,000
Disposal Group, Held-for-sale, Not Discontinued Operations | Clean Energy Businesses
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration from sale of business						$ 3,993,000,000	$ 6,800,000,000
Gain on sale of subsidiary		$ 13,000,000	835,000,000	$ 867,000,000	$ 865,000,000
Gain on sale of subsidiary, after tax			745,000,000	804,000,000	767,000,000
Downward price adjustment			30,000,000
Downward price adjustment, after tax			$ 22,000,000
Tax equity projects | project	3		3			2
Transaction costs, before tax	$ 0	1,000,000	$ 0	12,000,000
Transaction costs, after tax		$ 1,000,000		$ 8,000,000
Depreciation and amortization, before tax					41,000,000
Depreciation and amortization, after tax					$ 28,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Crane Project
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Holding period (in years)			5 years
Carrying value of tax equity interest	$ 6,000,000		$ 6,000,000
Electric Energy (MWh)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Notional amount | MWh	36,200,145		36,200,145
Broken Bow II | Electric Energy (MWh) | Clean Energy Businesses
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Deferred projects | project	1		1			1
Notional amount | MWh	75		75			75