Derivative Instruments and Hedging Activities - Hedged Volume of Derivative Transactions (Details)	Dec. 31, 2022 gal MMBTU MWh MW
Electric Energy
Derivatives, Fair Value [Line Items]
Notional amount | MWh	33,546,670
Capacity
Derivatives, Fair Value [Line Items]
Notional amount | MW	46,116
Natural Gas
Derivatives, Fair Value [Line Items]
Notional amount | MMBTU	290,398,144
Refined Fuels
Derivatives, Fair Value [Line Items]
Notional amount | gal	168,000
CECONY | Electric Energy
Derivatives, Fair Value [Line Items]
Notional amount | MWh	31,567,400
CECONY | Capacity
Derivatives, Fair Value [Line Items]
Notional amount | MW	30,675
CECONY | Natural Gas
Derivatives, Fair Value [Line Items]
Notional amount | MMBTU	272,790,000
CECONY | Refined Fuels
Derivatives, Fair Value [Line Items]
Notional amount | gal	168,000
Clean Energy Businesses | Electric Energy
Derivatives, Fair Value [Line Items]
Notional amount | MWh	240
Clean Energy Businesses | Capacity
Derivatives, Fair Value [Line Items]
Notional amount | MW	8,616
Clean Energy Businesses | Natural Gas
Derivatives, Fair Value [Line Items]
Notional amount | MMBTU	3,518,144