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Summary of Significant Accounting Policies and Other Matters - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ 3,337 | $ 3,298 | $ 9,264 | $ 9,117
Total revenues | 3,365 | 3,328 | 9,623 | 9,388
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 28 | 30 | 359 | 271
Clean Energy Businesses | Renewables | Engineering, procurement and construction |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 3 | 3 | 9 | 100
CECONY |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 2,877 | 2,899 | 8,248 | 8,121
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 3,365 | 3,328 | 9,623 | 9,388
Operating Segments | Clean Energy Businesses |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 207 | 92 | 518 | 338
Total revenues | 247 | 181 | 696 | 573
Operating Segments | Clean Energy Businesses | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 40 | 89 | 178 | 235
Operating Segments | Clean Energy Businesses | Renewables |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 193 | 68 | 465 | 273
Total revenues | 193 | 68 | 465 | 273
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 | 24 | 53 | 65
Total revenues | 14 | 24 | 53 | 65
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 | 40 | 89 | 178 | 235
Operating Segments | Clean Energy Businesses | Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 40 | 89 | 178 | 235
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 | 2,899 | 2,959 | 8,077 | 8,089
Total revenues | 2,877 | 2,899 | 8,248 | 8,121
Operating Segments | CECONY | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (22) | (60) | 171 | 32
Operating Segments | CECONY | Electric |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 2,582 | 2,631 | 6,048 | 6,106
Total revenues | 2,544 | 2,571 | 6,174 | 6,107
Operating Segments | CECONY | Electric | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (38) | (60) | 126 | 1
Operating Segments | CECONY | Gas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 263 | 264 | 1,573 | 1,516
Total revenues | 275 | 264 | 1,605 | 1,540
Operating Segments | CECONY | Gas | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 12 | 0 | 32 | 24
Operating Segments | CECONY | Steam |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 54 | 64 | 456 | 467
Total revenues | 58 | 64 | 469 | 474
Operating Segments | CECONY | Steam | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 4 | 0 | 13 | 7
Operating Segments | O&R |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 230 | 246 | 666 | 687
Total revenues | 241 | 246 | 678 | 691
Operating Segments | O&R | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 11 | 0 | 12 | 4
Operating Segments | O&R | Electric |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 205 | 215 | 488 | 508
Total revenues | 210 | 212 | 493 | 505
Operating Segments | O&R | Electric | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 5 | (3) | 5 | (3)
Operating Segments | O&R | Gas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 25 | 31 | 178 | 179
Total revenues | 31 | 34 | 185 | 186
Operating Segments | O&R | Gas | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 6 | 3 | 7 | 7
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Total revenues | (1) | 1 | (2) | 0
Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ (1) | $ 1 | $ (2) | $ 0

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