Variable Interest Entities - HLVB Method of Accounting (Details) - Variable Interest Entity, Primary Beneficiary - Clean Energy Businesses - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022
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)		29
Tax Equity Projects | Tax Equity Investors
Variable Interest Entity [Line Items]
Income (loss) before tax	$ (1)	(7)
Net income (loss)	(1)	(5)
Tax Equity Projects | Con Edison Development
Variable Interest Entity [Line Items]
Income (loss) before tax	18	28
Net income (loss)	$ 13	$ 21