Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Operating Leases
2023	$ 86
2024	81
2025	82
2026	82
2027	80
All years thereafter	964
Total future minimum lease payments	1,375
Less: imputed interest	(474)
Total	901
Operating lease liabilities (current)	127	$ 113
Operating lease liabilities (noncurrent)	774	717
Total	901
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	Other deferred credits and noncurrent liabilities
Other noncurrent liabilities	$ 2
Total	2
Subsidiaries
Operating Leases
Operating lease liabilities (current)	96	90
Operating lease liabilities (noncurrent)	522	$ 462
CECONY | Subsidiaries
Operating Leases
2023	63
2024	62
2025	63
2026	64
2027	63
All years thereafter	476
Total future minimum lease payments	791
Less: imputed interest	(173)
Total	618
Operating lease liabilities (current)	96
Operating lease liabilities (noncurrent)	522
Total	618
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	Other deferred credits and noncurrent liabilities
Other noncurrent liabilities	$ 1
Total	$ 1