Capitalization - Significant Debt Covenants (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Maximum ratio of consolidated debt to consolidated total capital	0.54
CECONY
Debt Instrument [Line Items]
Maximum ratio of consolidated debt to consolidated total capital	0.55
Tax-Exempt Debt | CECONY
Debt Instrument [Line Items]
Maximum ratio of consolidated debt to consolidated total capital	0.65
Term Loan | CECONY
Debt Instrument [Line Items]
Covenant principal balance amount limit	$ 150
Notes | CECONY
Debt Instrument [Line Items]
Covenant principal balance amount limit	$ 100