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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ 3,381 | $ 2,950 | $ 7,341 | $ 6,552
Total revenues | 3,415 | 2,971 | 7,475 | 6,648
Subsidiaries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 2,906 | 2,486 | 6,423 | 5,692
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 34 | 21 | 134 | 96
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 3,415 | 2,971 | 7,475 | 6,648
Operating Segments | Clean Energy Businesses |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 232 | 273 | 390 | 449
Total revenues | 272 | 291 | 532 | 515
Operating Segments | Clean Energy Businesses | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 40 | 18 | 142 | 66
Operating Segments | Clean Energy Businesses | Renewables |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 199 | 183 | 327 | 334
Total revenues | 199 | 183 | 327 | 334
Operating Segments | Clean Energy Businesses | Renewables | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Clean Energy Businesses | Energy services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 25 | 81 | 44 | 103
Total revenues | 25 | 81 | 44 | 103
Operating Segments | Clean Energy Businesses | Energy services | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Clean Energy Businesses | Develop/Transfer Projects |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 8 | 9 | 19 | 12
Total revenues | 8 | 9 | 19 | 12
Operating Segments | Clean Energy Businesses | Develop/Transfer Projects | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | Clean Energy Businesses | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Total revenues | 40 | 18 | 142 | 66
Operating Segments | Clean Energy Businesses | Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 40 | 18 | 142 | 66
Operating Segments | Con Edison Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 1 | 1 | 2 | 2
Total revenues | 1 | 1 | 2 | 2
Operating Segments | Con Edison Transmission | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | CECONY | Subsidiaries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 2,908 | 2,471 | 6,422 | 5,644
Total revenues | 2,906 | 2,486 | 6,423 | 5,692
Operating Segments | CECONY | Other | Subsidiaries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (2) | 15 | 1 | 48
Operating Segments | CECONY | Electric | Subsidiaries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 2,255 | 1,953 | 4,360 | 3,919
Total revenues | 2,240 | 1,963 | 4,324 | 3,931
Operating Segments | CECONY | Electric | Other | Subsidiaries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (15) | 10 | (36) | 12
Operating Segments | CECONY | Gas | Subsidiaries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 571 | 447 | 1,681 | 1,394
Total revenues | 582 | 449 | 1,713 | 1,423
Operating Segments | CECONY | Gas | Other | Subsidiaries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 11 | 2 | 32 | 29
Operating Segments | CECONY | Steam | Subsidiaries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 82 | 71 | 381 | 331
Total revenues | 84 | 74 | 386 | 338
Operating Segments | CECONY | Steam | Other | Subsidiaries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 2 | 3 | 5 | 7
Operating Segments | O&R | Subsidiaries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 240 | 205 | 527 | 457
Total revenues | 238 | 194 | 522 | 442
Operating Segments | O&R | Other | Subsidiaries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (2) | (11) | (5) | (15)
Operating Segments | O&R | Electric | Subsidiaries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 175 | 161 | 339 | 305
Total revenues | 177 | 153 | 342 | 299
Operating Segments | O&R | Electric | Other | Subsidiaries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 2 | (8) | 3 | (6)
Operating Segments | O&R | Gas | Subsidiaries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 65 | 44 | 188 | 152
Total revenues | 61 | 41 | 180 | 143
Operating Segments | O&R | Gas | Other | Subsidiaries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (4) | (3) | (8) | (9)
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Total revenues | (2) | (1) | (4) | (3)
Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ (2) | $ (1) | $ (4) | $ (3)

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