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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | $ 14,476 | $ 15,455 | $ 13,456
Cost of services provided | 14,663 | 15,670 | 13,676
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cost of services provided | 187 | 215 | 220
CECONY |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cost of services provided | 13,476 | 13,268 | 11,716
Operating Segments | Clean Energy Businesses |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 82 | 998 | 917
Cost of services provided | 129 | 1,319 | 1,022
Operating Segments | Clean Energy Businesses | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cost of services provided | 47 | 321 | 105
Operating Segments | Clean Energy Businesses | Renewables |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 68 | 637 | 638
Cost of services provided | 68 | 637 | 638
Operating Segments | Clean Energy Businesses | Renewables | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cost of services provided | 0 | 0 | 0
Operating Segments | Clean Energy Businesses | Energy services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 7 | 317 | 234
Cost of services provided | 7 | 317 | 234
Operating Segments | Clean Energy Businesses | Energy services | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cost of services provided | 0 | 0 | 0
Operating Segments | Clean Energy Businesses | Develop/Transfer Projects |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 7 | 44 | 45
Cost of services provided | 7 | 44 | 45
Operating Segments | Clean Energy Businesses | Develop/Transfer Projects | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cost of services provided | 0 | 0 | 0
Operating Segments | Clean Energy Businesses | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Cost of services provided | 47 | 321 | 105
Operating Segments | Clean Energy Businesses | Other | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cost of services provided | 47 | 321 | 105
Operating Segments | Con Edison Transmission |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 4 | 4 | 4
Cost of services provided | 4 | 4 | 4
Operating Segments | Con Edison Transmission | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cost of services provided | 0 | 0 | 0
Operating Segments | CECONY |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 13,364 | 13,376 | 11,579
Cost of services provided | 13,476 | 13,268 | 11,716
Operating Segments | CECONY | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cost of services provided | 112 | (108) | 137
Operating Segments | CECONY | Decoupling Mechanism |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cost of services provided |  |  | 48
Operating Segments | CECONY | Net EAMs |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cost of services provided |  |  | 34
Operating Segments | CECONY | LPCs |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cost of services provided |  |  | 74
Operating Segments | CECONY | Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 9,946 | 9,917 | 8,736
Cost of services provided | 10,078 | 9,751 | 8,806
Operating Segments | CECONY | Electric | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cost of services provided | 132 | (166) | 70
Operating Segments | CECONY | Gas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 2,867 | 2,875 | 2,324
Cost of services provided | 2,829 | 2,924 | 2,378
Operating Segments | CECONY | Gas | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cost of services provided | (38) | 49 | 54
Operating Segments | CECONY | Steam |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 551 | 584 | 519
Cost of services provided | 569 | 593 | 532
Operating Segments | CECONY | Steam | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cost of services provided | 18 | 9 | 13
Operating Segments | O&R |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 1,026 | 1,077 | 956
Cost of services provided | 1,056 | 1,085 | 941
Operating Segments | O&R | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cost of services provided | 30 | 8 | (15)
Operating Segments | O&R | Decoupling Mechanism |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cost of services provided |  |  | (18)
Operating Segments | O&R | Net EAMs |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cost of services provided |  |  | 2
Operating Segments | O&R | LPCs |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cost of services provided |  |  | 4
Operating Segments | O&R | Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 740 | 771 | 691
Cost of services provided | 759 | 773 | 681
Operating Segments | O&R | Electric | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cost of services provided | 19 | 2 | (10)
Operating Segments | O&R | Gas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 286 | 306 | 265
Cost of services provided | 297 | 312 | 260
Operating Segments | O&R | Gas | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cost of services provided | 11 | 6 | (5)
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Cost of services provided | (2) | (6) | (7)
Other | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cost of services provided | $ (2) | $ (6) | $ (7)

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