Derivative Instruments and Hedging Activities - Hedged Volume of Derivative Transactions (Details)	Dec. 31, 2024 MWh gal MW MMBTU
Electric Energy
Derivatives, Fair Value [Line Items]
Notional amount | MWh	33,303,430
Capacity
Derivatives, Fair Value [Line Items]
Notional amount | MW	31,500
Natural Gas
Derivatives, Fair Value [Line Items]
Notional amount | MMBTU	313,300,000
Refined Fuels
Derivatives, Fair Value [Line Items]
Notional amount | gal	3,780,000
CECONY | Electric Energy
Derivatives, Fair Value [Line Items]
Notional amount | MWh	30,466,200
CECONY | Capacity
Derivatives, Fair Value [Line Items]
Notional amount | MW	24,000
CECONY | Natural Gas
Derivatives, Fair Value [Line Items]
Notional amount | MMBTU	292,340,000
CECONY | Refined Fuels
Derivatives, Fair Value [Line Items]
Notional amount | gal	3,780,000