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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ 3,338 | $ 3,337 | $ 9,123 | $ 9,264
Total revenues | 3,333 | 3,365 | 9,286 | 9,623
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (5) | 28 | 163 | 359
Clean Energy Businesses | Renewables | Engineering, procurement and construction |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 2 | 3 | 6 | 9
CECONY |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 2,872 | 2,877 | 8,072 | 8,248
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 3,333 | 3,365 |  |
Operating Segments | Electric |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  |  | 9,286 | 9,623
Operating Segments | Clean Energy Businesses |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 208 | 207 | 523 | 518
Total revenues | 222 | 247 | 566 | 696
Operating Segments | Clean Energy Businesses | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 14 | 40 | 43 | 178
Operating Segments | Clean Energy Businesses | Renewables |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 194 | 193 | 487 | 465
Total revenues | 194 | 193 | 487 | 465
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 | 14 | 14 | 36 | 53
Total revenues | 14 | 14 | 36 | 53
Operating Segments | Clean Energy Businesses | Energy services | 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 | 14 | 40 | 43 | 178
Operating Segments | Clean Energy Businesses | Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 14 | 40 | 43 | 178
Operating Segments | Con Edison Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 1 | 1 | 3 | 3
Total revenues | 1 | 1 | 3 | 3
Operating Segments | Con Edison Transmission | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Operating Segments | CECONY |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 2,892 | 2,899 | 7,963 | 8,077
Total revenues | 2,872 | 2,877 | 8,072 | 8,248
Operating Segments | CECONY | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (20) | (22) | 109 | 171
Operating Segments | CECONY | Electric |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 2,594 | 2,582 | 6,108 | 6,048
Total revenues | 2,562 | 2,544 | 6,178 | 6,174
Operating Segments | CECONY | Electric | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (32) | (38) | 70 | 126
Operating Segments | CECONY | Gas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 248 | 263 | 1,480 | 1,573
Total revenues | 259 | 275 | 1,509 | 1,605
Operating Segments | CECONY | Gas | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 11 | 12 | 29 | 32
Operating Segments | CECONY | Steam |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 50 | 54 | 375 | 456
Total revenues | 51 | 58 | 385 | 469
Operating Segments | CECONY | Steam | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1 | 4 | 10 | 13
Operating Segments | O&R |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 237 | 230 | 634 | 666
Total revenues | 238 | 241 | 647 | 678
Operating Segments | O&R | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1 | 11 | 13 | 12
Operating Segments | O&R | Electric |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 210 | 205 | 478 | 488
Total revenues | 208 | 210 | 483 | 493
Operating Segments | O&R | Electric | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (2) | 5 | 5 | 5
Operating Segments | O&R | Gas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 27 | 25 | 156 | 178
Total revenues | 30 | 31 | 164 | 185
Operating Segments | O&R | Gas | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 3 | 6 | 8 | 7
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Total revenues | 0 | (1) | (2) | (2)
Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 0 | $ (1) | $ (2) | $ (2)

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