Variable Interest Entities - HLVB Method of Accounting (Details) - Variable Interest Entity, Primary Beneficiary - Clean Energy Businesses - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022
CED Nevada Virginia | Tax Equity Investors
Variable Interest Entity [Line Items]
Income (loss) before tax	$ 6	$ (36)
Net income (loss)	5	(27)
CED Nevada Virginia | Con Edison Development
Variable Interest Entity [Line Items]
Income (loss) before tax	(7)	32
Net income (loss)	(5)	24
Tax Equity Projects | Tax Equity Investors
Variable Interest Entity [Line Items]
Income (loss) before tax	0	(7)
Net income (loss)	0	(5)
Tax Equity Projects | Con Edison Development
Variable Interest Entity [Line Items]
Income (loss) before tax	16	44
Net income (loss)	$ 12	$ 33