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Dispositions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Carrying value of projects sold $ 44,214.0     $ 42,024.0
Stagecoach        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Equity method investment   $ 630.0 $ 667.0  
Clean Energy Businesses | Subsidiaries        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Carrying value of projects sold   $ 192.0    
Gain (loss) on sale of projects 3.0      
Gain on sale, after tax 2.0      
Equity method investment 11.0      
Con Edison Transmission | Subsidiaries | Stagecoach        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from sale 1,225.0      
CET Gas | Subsidiaries | Stagecoach        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from sale $ 629.0