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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ 2,627 | $ 2,604 | $ 5,784 | $ 5,932
Total revenues | 2,719 | 2,744 | 5,953 | 6,258
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 92 | 140 | 169 | 326
Clean Energy Businesses | Renewables | Engineering, procurement and construction |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 2 | 4 | 4 | 6
CECONY |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 2,345 | 2,331 | 5,200 | 5,371
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 2,719 | 2,744 |  |
Operating Segments | Electric |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  |  | 5,953 | 6,258
Operating Segments | Clean Energy Businesses |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 189 | 187 | 314 | 317
Total revenues | 198 | 233 | 344 | 450
Operating Segments | Clean Energy Businesses | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 9 | 46 | 30 | 133
Operating Segments | Clean Energy Businesses | Renewables |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 178 | 171 | 292 | 278
Total revenues | 178 | 171 | 292 | 278
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 | 11 | 16 | 22 | 39
Total revenues | 11 | 16 | 22 | 39
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 | 9 | 46 | 30 | 133
Operating Segments | Clean Energy Businesses | Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 9 | 46 | 30 | 133
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 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 2,261 | 2,237 | 5,071 | 5,177
Total revenues | 2,345 | 2,331 | 5,200 | 5,371
Operating Segments | CECONY | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 84 | 94 | 129 | 194
Operating Segments | CECONY | Electric |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 1,781 | 1,751 | 3,514 | 3,465
Total revenues | 1,845 | 1,833 | 3,616 | 3,630
Operating Segments | CECONY | Electric | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 64 | 82 | 102 | 165
Operating Segments | CECONY | Gas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 399 | 400 | 1,232 | 1,310
Total revenues | 416 | 408 | 1,250 | 1,330
Operating Segments | CECONY | Gas | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 17 | 8 | 18 | 20
Operating Segments | CECONY | Steam |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 81 | 86 | 325 | 402
Total revenues | 84 | 90 | 334 | 411
Operating Segments | CECONY | Steam | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 3 | 4 | 9 | 9
Operating Segments | O&R |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 176 | 179 | 397 | 436
Total revenues | 175 | 179 | 408 | 437
Operating Segments | O&R | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (1) | 0 | 11 | 1
Operating Segments | O&R | Electric |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 139 | 140 | 267 | 283
Total revenues | 138 | 138 | 274 | 283
Operating Segments | O&R | Electric | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (1) | (2) | 7 | 0
Operating Segments | O&R | Gas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 37 | 39 | 130 | 153
Total revenues | 37 | 41 | 134 | 154
Operating Segments | O&R | Gas | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0 | 2 | 4 | 1
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers |  |  | 0 | 0
Total revenues | $ 0 | $ 0 | (1) | (2)
Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  |  | $ (1) | $ (2)

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