Leases - Additional Information (Details) - CECONY - Subsidiaries	Sep. 30, 2024 lease_agreement
Lessee, Lease, Description [Line Items]
Number of operating lease agreements	2
Lease Expected To Commence In 2 Years With 15 Year Lease Term
Lessee, Lease, Description [Line Items]
Operating lease, lease not yet commenced, expected period to commence (in years)	2 years
Lease Expected To Commence In 3 Years With 15 Year Lease Term
Lessee, Lease, Description [Line Items]
Operating lease, not yet commenced, term of contract (in years)	15 years
Operating lease, lease not yet commenced, expected period to commence (in years)	3 years