Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Operating Leases
2024	$ 64
2025	65
2026	65
2027	64
2028	62
All years thereafter	418
Total future minimum lease payments	738
Less: imputed interest	(157)
Total	581
Operating lease liabilities (current)	107	$ 103
Operating lease liabilities (noncurrent)	474	476
Total	581
Finance Leases
2024	0
2025	1
2026	0
2027	0
2028	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
Broken Bow II
Operating Leases
2024	3
2025	3
2026	3
2027	3
2028	3
All years thereafter	10
Less: imputed interest	(6)
Operating lease liabilities (current)	7
Subsidiaries
Operating Leases
Operating lease liabilities (current)	106	103
Operating lease liabilities (noncurrent)	472	$ 475
CECONY | Subsidiaries
Operating Leases
2024	63
2025	63
2026	65
2027	64
2028	62
All years thereafter	418
Total future minimum lease payments	735
Less: imputed interest	(157)
Total	578
Operating lease liabilities (current)	106
Operating lease liabilities (noncurrent)	472
Total	578
Finance Leases
2024	0
2025	1
2026	0
2027	0
2028	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