Variable Interest Entities - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2021
Variable Interest Entity [Line Items]
Noncontrolling interest	$ 299	$ 218
Clean Energy Businesses
Variable Interest Entity [Line Items]
Equity method investment			$ 11
Loss from the project, pre-tax	11
Loss from the project, after-tax	8
Tax Equity Investors
Variable Interest Entity [Line Items]
Noncontrolling interest	95
Tax Equity Projects | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Income (loss)	(30)	(6)
Income (loss), after tax	(24)	(4)
Tax Equity Projects | Tax Equity Investors | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Income (loss)	6	43
Income (loss), after tax	4	$ 32
CED Nevada Virginia | Con Edison Development
Variable Interest Entity [Line Items]
Loss from the project, pre-tax	155
Loss from the project, after-tax	117
CED Nevada Virginia | Tax Equity Investors
Variable Interest Entity [Line Items]
Loss from the project, pre-tax	158
Loss from the project, after-tax	$ 119