Derivative Instruments and Hedging Activities - Schedule of Hedged Volume of Derivative Transactions (Details)	6 Months Ended
Jun. 30, 2026 MWh MW-M MMBTU gal
Electric Energy (MWh)
Derivatives, Fair Value [Line Items]
Notional amount, energy \| MWh	37,754,800
Capacity (MW)
Derivatives, Fair Value [Line Items]
Notional amount, energy \| MW-M	26,100
Natural Gas (Dt)
Derivatives, Fair Value [Line Items]
Notional amount, energy \| MMBTU	304,680,000
Refined Fuels (gallons)
Derivatives, Fair Value [Line Items]
Notional amount, volume \| gal	2,268,000
CECONY \| Electric Energy (MWh) \| Subsidiaries
Derivatives, Fair Value [Line Items]
Notional amount, energy \| MWh	36,017,425
CECONY \| Capacity (MW) \| Subsidiaries
Derivatives, Fair Value [Line Items]
Notional amount, energy \| MW-M	16,125
CECONY \| Natural Gas (Dt) \| Subsidiaries
Derivatives, Fair Value [Line Items]
Notional amount, energy \| MMBTU	281,370,000
CECONY \| Refined Fuels (gallons) \| Subsidiaries
Derivatives, Fair Value [Line Items]
Notional amount, volume \| gal	2,268,000

Nominal energy measure used to calculate payments on a derivative instrument.

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Nominal volume used to calculate payments on a derivative instrument.

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