Leases - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Lessee, Lease, Description [Line Items]
Lease, renewal term (in years)	5 years
Assets under finance leases	$ 2	$ 2	$ 2
Finance leases, accumulated amortization	2	5	4
Right-of-use asset obtained in exchange for operating lease liability	11	79
Clean Energy Businesses
Lessee, Lease, Description [Line Items]
Right-of-use asset, held for sale		10
CECONY
Lessee, Lease, Description [Line Items]
Assets under finance leases	1	1	1
Finance leases, accumulated amortization	2	2	$ 2
Right-of-use asset obtained in exchange for operating lease liability	$ 11	$ 68
Minimum
Lessee, Lease, Description [Line Items]
Lease, term (in years)	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease, term (in years)	20 years