Variable Interest Entities - HLVB Method of Accounting (Details) - Variable Interest Entity, Primary Beneficiary - Clean Energy Businesses $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($)
CED Nevada Virginia | Tax Equity Investors
Variable Interest Entity [Line Items]
Income (loss) before tax	$ (42)
Net income (loss)	(32)
CED Nevada Virginia | Con Edison Development
Variable Interest Entity [Line Items]
Income (loss) before tax	39
Net income (loss)	30
Tax Equity Projects | Tax Equity Investors
Variable Interest Entity [Line Items]
Income (loss) before tax	(5)
Net income (loss)	(4)
Tax Equity Projects | Con Edison Development
Variable Interest Entity [Line Items]
Income (loss) before tax	10
Net income (loss)	$ 7