Regulatory Matters - Rate Plans (Details) $ in Millions		1 Months Ended					2 Months Ended	36 Months Ended
	Dec. 31, 2021 USD ($)	Apr. 30, 2023 USD ($) state	Mar. 31, 2023 USD ($)	Feb. 28, 2023 USD ($)	Nov. 30, 2022 USD ($)	Jan. 31, 2022 USD ($)	Apr. 30, 2023 USD ($) state	Dec. 31, 2022 USD ($)
Subsequent Event
Public Utilities, General Disclosures [Line Items]
Number of states | state		7					7
Subsequent Event | Brooklyn Clean Energy Hub
Public Utilities, General Disclosures [Line Items]
Estimated cost recovery		$ 810.0
CECONY | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Federal grants applied for							$ 177.0
CECONY | Subsequent Event | Federal Grants Used For Carbon-Free Hydrogen
Public Utilities, General Disclosures [Line Items]
Federal grants applied for							116.0
CECONY | Electric | Year 1
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount				$ 442.0				$ 457.0
CECONY | Electric | Year 2
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount				518.0				457.0
CECONY | Electric | Year 3
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount				$ 382.0				457.0
CECONY | Electric | Subsidiaries
Public Utilities, General Disclosures [Line Items]
Return on common equity (as a percent)				9.25%
Common equity ratio (percent)				48.00%
Capital expenditures				$ 8,500.0
CECONY | Gas | Year 1
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount				217.0				187.0
CECONY | Gas | Year 2
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount				173.0				187.0
CECONY | Gas | Year 3
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount				122.0				$ 187.0
CECONY | Gas | Subsidiaries
Public Utilities, General Disclosures [Line Items]
Capital expenditures				3,300.0
CECONY | Steam
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			$ 94.0
Common equity ratio (percent)					50.00%
Deviation of actual inflation rate from assumed revenue requirement					0.0050
Return on common equity (percent)					10.00%
CECONY | Steam | Year 1
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount				4.0
Total requested amount				141.0
CECONY | Steam | Year 2
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount				1.0	$ 54.0
Total requested amount				55.0
CECONY | Steam | Year 3
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount				4.0	49.0
Total requested amount				$ 53.0
CECONY | Steam | Subsidiaries
Public Utilities, General Disclosures [Line Items]
Return on common equity (as a percent)			9.00%
Common equity ratio (percent)			48.00%
CECONY | Electric and Gas Transmission Projects | Subsidiaries
Public Utilities, General Disclosures [Line Items]
Rate plan, term (in years)				3 years
CECONY | NYSPSC | Steam
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount					$ 137.0
Return on common equity (as a percent)					10.00%
Common equity ratio (percent)					50.00%
RECO | Electric
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	$ 16.9					$ 20.4
Common equity ratio (percent)						47.00%
Return on common equity (percent)						11.04%
O&R | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Federal grants applied for							$ 125.0