Derivative Instruments and Hedging Activities - Hedged Volume of Derivative Transactions (Details)	Dec. 31, 2023 MMBTU MW gal MWh
Electric Energy
Derivatives, Fair Value [Line Items]
Notional amount | MWh	34,892,535
Capacity
Derivatives, Fair Value [Line Items]
Notional amount | MW	44,400
Natural Gas
Derivatives, Fair Value [Line Items]
Notional amount | MMBTU	325,690,000
Refined Fuels
Derivatives, Fair Value [Line Items]
Notional amount | gal	3,780,000
CECONY | Electric Energy
Derivatives, Fair Value [Line Items]
Notional amount | MWh	32,315,225
CECONY | Capacity
Derivatives, Fair Value [Line Items]
Notional amount | MW	34,500
CECONY | Natural Gas
Derivatives, Fair Value [Line Items]
Notional amount | MMBTU	306,700,000
CECONY | Refined Fuels
Derivatives, Fair Value [Line Items]
Notional amount | gal	3,780,000