Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Operating Leases
2023	$ 84
2024	81
2025	82
2026	81
2027	81
All years thereafter	963
Total future minimum lease payments	1,372
Less: imputed interest	(469)
Total	903
Operating lease liabilities (current)	131	$ 113
Operating Lease, Liability, Noncurrent	772	717
Total	903
Finance Leases
2023	0
2024	1
2025	0
2026	0
2027	0
All years thereafter	1
Total future minimum lease payments	2
Less: imputed interest	$ 0
Finance lease, liability, noncurrent, statement of financial position	Deferred Credits and Other Liabilities, Noncurrent
Other noncurrent liabilities	$ 2
Total	2
Subsidiaries
Operating Leases
Operating lease liabilities (current)	99	90
Operating Lease, Liability, Noncurrent	523	$ 462
CECONY | Subsidiaries
Operating Leases
2023	63
2024	62
2025	63
2026	63
2027	64
All years thereafter	472
Total future minimum lease payments	787
Less: imputed interest	(165)
Total	622
Operating lease liabilities (current)	99
Operating Lease, Liability, Noncurrent	523
Total	622
Finance Leases
2023	0
2024	1
2025	0
2026	0
2027	0
All years thereafter	0
Total future minimum lease payments	1
Less: imputed interest	$ 0
Finance lease, liability, noncurrent, statement of financial position	Deferred Credits and Other Liabilities, Noncurrent
Other noncurrent liabilities	$ 1
Total	$ 1