Face (par) amount of debt instrument at time of issuance.

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Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Capitalization - Long-term Debt, Additional Information (Details) - USD ($)	Dec. 31, 2022	Jun. 30, 2022
Debt Instrument [Line Items]
Debt instrument, face amount		$ 400,000,000
CECONY \| Tax-Exempt Debt
Debt Instrument [Line Items]
Debt instrument, face amount	$ 450,000,000