Capitalization - Narrative (Details) - CECONY $ in Millions	May 31, 2024 USD ($)
5.375 Percent Debentures, due 2034
Debt Instrument [Line Items]
Face amount of debt	$ 400
Interest rate (percent)	5.375%
5.70 Percent Debentures, due 2054
Debt Instrument [Line Items]
Face amount of debt	$ 1,000
Interest rate (percent)	5.70%