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Dispositions (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2021
May 31, 2021
Mar. 31, 2022
Jun. 30, 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       $ 42,953 $ 42,953   $ 42,024
Stagecoach Gas Services LLC              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Equity method investments       630 630 $ 667  
Loss on sale of investment (pre-tax)       39 211    
Loss on sale of investment       27 147    
Subsidiaries              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Carrying value of projects sold       40,432 40,432   $ 39,552
Clean Energy Businesses | Subsidiaries              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Carrying value of projects sold       180 180    
Gain (loss) on sale of projects       3 3    
Gain on sale, after tax       2 2    
Equity method investments       $ 11 $ 11    
Con Edison Transmission | Subsidiaries | Stagecoach Gas Services LLC              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Proceeds from sale   $ 1,225          
Con Edison Transmission | Subsidiaries | Stagecoach Gas Services LLC | Scenario, Forecast              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Proceeds from sale     $ 30        
Con Edison Transmission | Subsidiaries | Stagecoach Gas Services LLC | Subsequent Event              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Proceeds from sale $ 1,195