Leases - Other Related Information (Details)	Mar. 31, 2022	Dec. 31, 2021
Lessee, Lease, Description [Line Items]
Weighted Average Remaining Lease Term, Operating leases	18 years 2 months 12 days	18 years 6 months
Weighted Average Remaining Lease Term, Finance leases	7 years 2 months 12 days	7 years 1 month 6 days
Weighted Average Discount Rate, Operating leases	4.30%	4.30%
Weighted Average Discount Rate, Finance leases	1.80%	1.80%
CECONY | Subsidiaries
Lessee, Lease, Description [Line Items]
Weighted Average Remaining Lease Term, Operating leases	11 years 10 months 24 days	12 years 1 month 6 days
Weighted Average Remaining Lease Term, Finance leases	3 years	3 years 1 month 6 days
Weighted Average Discount Rate, Operating leases	3.50%	3.50%
Weighted Average Discount Rate, Finance leases	1.10%	1.10%