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, 2021	Sep. 30, 2022	Sep. 30, 2021
CED Nevada Virginia | Tax Equity Investors
Variable Interest Entity [Line Items]
Income (loss) before tax	$ (6)	$ 74	$ 36	$ 127
Net income (loss)	(5)	56	27	96
CED Nevada Virginia | Con Edison Development
Variable Interest Entity [Line Items]
Income (loss) before tax	(7)	74	32	127
Net income (loss)	(5)	56	24	96
Tax Equity Projects | Tax Equity Investors
Variable Interest Entity [Line Items]
Income (loss) before tax	0	0	(7)	8
Net income (loss)	0	0	(5)	6
Tax Equity Projects | Con Edison Development
Variable Interest Entity [Line Items]
Income (loss) before tax	16	14	44	27
Net income (loss)	$ 12	$ 11	$ 33	$ 20