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v3.20.4

Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ 12,026 | $ 12,144 | $ 11,928 |
Revenues | 12,246 | 12,574 | 12,337 | $ 12,033
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 220 | 430 | 409 |
Clean Energy Businesses | Renewables [Member] | Engineering, procurement and construction |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 8 | 14 | 103 |
CECONY |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 10,647 | 10,821 | 10,680 |
Operating Segments | Clean Energy Businesses |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 661 | 646 | 424 |
Revenues | 736 | 857 | 763 |
Operating Segments | Clean Energy Businesses | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 75 | 211 | 339 |
Operating Segments | Clean Energy Businesses | Renewables [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 609 | 575 | 329 |
Revenues | 609 | 575 | 329 |
Operating Segments | Clean Energy Businesses | Renewables [Member] | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 |
Operating Segments | Clean Energy Businesses | Energy Service [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 52 | 71 | 95 |
Revenues | 52 | 71 | 95 |
Operating Segments | Clean Energy Businesses | Energy Service [Member] | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 |
Operating Segments | Clean Energy Businesses | Other Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 |
Revenues | 75 | 211 | 339 |
Operating Segments | Clean Energy Businesses | Other Services [Member] | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 75 | 211 | 339 |
Operating Segments | Con Edison Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 4 | 4 | 4 |
Revenues | 4 | 4 | 4 |
Operating Segments | Con Edison Transmission | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 |
Operating Segments | CECONY |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 10,518 | 10,620 | 10,597 |
Revenues | 10,647 | 10,821 | 10,680 |
Operating Segments | CECONY | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 129 | 201 | 83 |
Operating Segments | CECONY | Electric |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 8,026 | 7,913 | 7,920 |
Revenues | 8,103 | 8,062 | 7,971 |
Operating Segments | CECONY | Electric | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 77 | 149 | 51 |
Operating Segments | CECONY | Gas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 1,998 | 2,097 | 2,052 |
Revenues | 2,036 | 2,132 | 2,078 |
Operating Segments | CECONY | Gas | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 38 | 35 | 26 |
Operating Segments | CECONY | Steam |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 494 | 610 | 625 |
Revenues | 508 | 627 | 631 |
Operating Segments | CECONY | Steam | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 14 | 17 | 6 |
Operating Segments | O&R |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 843 | 874 | 903 |
Revenues | 862 | 893 | 891 |
Operating Segments | O&R | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 19 | 19 | (12) |
Operating Segments | O&R | Electric |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 619 | 627 | 647 |
Revenues | 629 | 634 | 642 |
Operating Segments | O&R | Electric | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 10 | 7 | (5) |
Operating Segments | O&R | Gas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 224 | 247 | 256 |
Revenues | 233 | 259 | 249 |
Operating Segments | O&R | Gas | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 9 | 12 | (7) |
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 |
Revenues | (3) | (1) | (1) |
Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (3) | (1) | (1) |
Other | O&R |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 0 | $ 0 | $ 0 |

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