Regulatory Matters - Utility Rate Narrative (Details) $ in Thousands				1 Months Ended						12 Months Ended		23 Months Ended	35 Months Ended	36 Months Ended
	Feb. 15, 2023	Jan. 01, 2022 USD ($)	Dec. 31, 2021 USD ($)	Feb. 28, 2023 USD ($)	Dec. 31, 2022 USD ($)	Nov. 30, 2022 USD ($)	Apr. 30, 2022	Jan. 31, 2022 USD ($)	Jul. 31, 2021	Dec. 31, 2023 USD ($) substation	Dec. 31, 2022	Dec. 31, 2021	Jan. 31, 2020	Dec. 31, 2025	Dec. 31, 2024 USD ($)	Dec. 31, 2021 USD ($)
Scenario, Forecast | Eastern Queens Reliability Project | Substation
Public Utilities, General Disclosures [Line Items]
Estimated cost of substations										$ 1,100,000
CECONY | Scenario, Forecast | Eastern Queens Reliability Project
Public Utilities, General Disclosures [Line Items]
Number of substations | substation										2
Minimum number of days after adoption of the join proposal to petition										30 days
RECO
Public Utilities, General Disclosures [Line Items]
Common equity ratio (percent)								48.51%				48.32%	49.70%
RECO | New Jersey Board of Public Utilities
Public Utilities, General Disclosures [Line Items]
Investment plan					$ 47,800
Investment plan, term (in years)					5 years
Electric | CECONY
Public Utilities, General Disclosures [Line Items]
Common equity ratio (percent)											48.00%
Electric | CECONY | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Common equity ratio (percent)														48.00%
Electric | RECO
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			$ 16,900					$ 20,400
Return on common equity (percent)								11.04%	0.50%
Electric | RECO | New Jersey Board of Public Utilities
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		$ 9,650
Electric | O&R
Public Utilities, General Disclosures [Line Items]
Common equity ratio (percent)																48.00%
Electric | O&R | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Common equity ratio (percent)															48.00%
Steam | CECONY
Public Utilities, General Disclosures [Line Items]
Return on common equity (percent)						10.00%
Common equity ratio (percent)						50.00%
Deviation of inflation rate and revenue requirement (in basis points)						50
Steam | CECONY | NYSPSC
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount						$ 137,000
Return on common equity (percent)						10.00%
Common equity ratio (percent)						50.00%
Electric and Gas Transmission Projects | O&R | Subsidiaries
Public Utilities, General Disclosures [Line Items]
Public utility, rate plan term (in years)							3 years
Electric and Gas Transmission Projects | O&R | Subsidiaries | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Public utility, rate plan term (in years)	3 years
Rate Plan for Year 1 | Electric | O&R
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount																$ 8,600
Rate Plan for Year 1 | Electric | O&R | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount															$ 11,700
Rate Plan for Year 1 | Steam | CECONY | Subsequent Event | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount				$ 4,000
Total requested amount				141,000
Rate Plan for Year 2 | Electric | O&R
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount																12,100
Rate Plan for Year 2 | Electric | O&R | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount															11,700
Rate Plan for Year 2 | Steam | CECONY
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount						$ 54,000
Rate Plan for Year 2 | Steam | CECONY | Subsequent Event | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount				1,000
Total requested amount				55,000
Rate Plan for Year 3 | Electric | O&R
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount																$ 12,200
Rate Plan for Year 3 | Electric | O&R | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount															$ 11,700
Rate Plan for Year 3 | Steam | CECONY
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount						$ 49,000
Rate Plan for Year 3 | Steam | CECONY | Subsequent Event | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount				4,000
Total requested amount				$ 53,000