Dispositions - Narrative (Details) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2025 USD ($)	Dec. 31, 2024 USD ($) MWh project	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Mar. 01, 2023 USD ($) MWh solarProject	Oct. 01, 2022 USD ($)	Dec. 31, 2021 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of solar projects		2			2
Unbilled contracts receivable		$ 4	$ 4	$ 80			$ 35
Electric Energy
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Notional amount | MWh		33,303,430
Clean Energy Businesses | Renewables Americas, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Estimate of possible loss		$ 24
Unbilled contracts receivable		4
Clean Energy Businesses | Renewables Americas, LLC | Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Estimate of possible loss		172
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 the project is sold					$ 3,993	$ 6,800
Gain (loss) on disposition of stock in subsidiary		62	865
Gain (loss) on disposition of stock in subsidiary, after tax		46	767
Downward price adjustment		33
Downward price adjustment, after tax		25
Disposal group, including discontinue operation, transaction costs		0	12	48
Disposal group, including discontinue operation, transaction costs, after tax		0	9	$ 35
Depreciation and amortization, before tax		41
Depreciation and amortization, after tax		$ 28
Disposal Group, Held-for-sale, Not Discontinued Operations | Clean Energy Businesses | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration the project is sold	$ 54
Downward price adjustment	33
Downward price adjustment, after tax	25
Disposal Group, Held-for-sale, Not Discontinued Operations | Clean Energy Businesses | Broken Bow II | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration the project is sold	$ 54
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		$ 4	$ 13
Clean Energy Businesses | Electric Energy | Broken Bow II
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Notional amount | MWh		75			75
CECONY | Electric Energy
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Notional amount | MWh		30,466,200