Capitalization - Significant Debt Covenants (Details)	12 Months Ended
	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Maximum ratio of consolidated debt to consolidated total capital	0.52
Covenant principal balance amount limit	$ 100,000,000
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	$ 150,000,000
Notes
Debt Instrument [Line Items]
Maximum ratio of consolidated debt to consolidated total capital	0.675
Notes | CECONY
Debt Instrument [Line Items]
Covenant principal balance amount limit	$ 100,000,000