Environmental Matters - Accrued Liabilities and Regulatory Assets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Site Contingency [Line Items]
Accrued Liabilities	$ 997	$ 940
Regulatory assets	4,279	3,845
Manufactured gas plant sites
Site Contingency [Line Items]
Accrued Liabilities	876	845
Other Superfund Sites
Site Contingency [Line Items]
Accrued Liabilities	121	95
Superfund Sites
Site Contingency [Line Items]
Accrued Liabilities	997	940
Regulatory assets	991	938
CECONY
Site Contingency [Line Items]
Accrued Liabilities	903	850
CECONY | Manufactured gas plant sites
Site Contingency [Line Items]
Accrued Liabilities	782	755
CECONY | Other Superfund Sites
Site Contingency [Line Items]
Accrued Liabilities	121	95
CECONY | Superfund Sites
Site Contingency [Line Items]
Accrued Liabilities	903	850
Regulatory assets	$ 906	$ 860