Regulatory Matters - Rate Plans (Details) - USD ($) $ in Millions		1 Months Ended
	Jan. 22, 2022	Jul. 31, 2021	May 31, 2021	Jan. 01, 2022
O&R | NYSPSC | Gas | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Approved rate increase	$ 8.6
O&R | NYSPSC | Gas | Subsidiaries | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Approved rate				$ 1.2
O&R | NYSPSC | Electric | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Approved rate increase	$ 3.3
O&R | NYSPSC | Electric | Subsidiaries | Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Approved rate				$ 27.8
RECO | NJBPU | Electric | Subsidiaries
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			$ 16.9
Return on common equity (percent)			1000.00%
Common equity ratio (percent)			4925.00%
RECO | NJBPU | Electric | Subsidiaries | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount		$ 16.1
Return on common equity (percent)		10.00%
Common equity ratio (percent)		4851.00%
RECO | NJBPU | Electric | Deferred storm costs | Subsidiaries
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			$ 1.0