Leases - Other Related Information (Details)	Dec. 31, 2022	Dec. 31, 2021
Lessee, Lease, Description [Line Items]
Weighted Average Remaining Lease Term, Operating leases (in years)	12 years 3 months 18 days	18 years 6 months
Weighted Average Remaining Lease Term, Finance leases (in years)	7 years 2 months 12 days	7 years 1 month 6 days
Weighted Average Discount Rate, Operating leases (percent)	3.70%	4.30%
Weighted Average Discount Rate, Finance leases (percent)	1.90%	1.80%
Clean Energy Businesses
Lessee, Lease, Description [Line Items]
Weighted Average Remaining Lease Term, Operating leases (in years)	18 years 3 months 18 days
Weighted Average Discount Rate, Operating leases (percent)	4.40%
CECONY
Lessee, Lease, Description [Line Items]
Weighted Average Remaining Lease Term, Operating leases (in years)	12 years 4 months 24 days	12 years 1 month 6 days
Weighted Average Remaining Lease Term, Finance leases (in years)	2 years 3 months 18 days	3 years 1 month 6 days
Weighted Average Discount Rate, Operating leases (percent)	3.70%	3.50%
Weighted Average Discount Rate, Finance leases (percent)	1.00%	1.10%