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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | $ 3,157 | $ 3,328
Total revenues | 3,234 | 3,514
Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 77 | 186
Clean Energy Businesses | Renewables | Engineering, procurement and construction |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 3 | 2
CECONY |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 2,854 | 3,039
Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 3,234 | 3,514
Operating Segments | Clean Energy Businesses |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 125 | 129
Total revenues | 146 | 217
Operating Segments | Clean Energy Businesses | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 21 | 88
Operating Segments | Clean Energy Businesses | Renewables |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 114 | 106
Total revenues | 114 | 106
Operating Segments | Clean Energy Businesses | Renewables | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Operating Segments | Clean Energy Businesses | Energy services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 11 | 23
Total revenues | 11 | 23
Operating Segments | Clean Energy Businesses | Energy services | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Operating Segments | Clean Energy Businesses | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Total revenues | 21 | 88
Operating Segments | Clean Energy Businesses | Other | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 21 | 88
Operating Segments | Con Edison Transmission |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 1 | 1
Total revenues | 1 | 1
Operating Segments | Con Edison Transmission | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 0 | 0
Operating Segments | CECONY |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 2,810 | 2,941
Total revenues | 2,854 | 3,039
Operating Segments | CECONY | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 44 | 98
Operating Segments | CECONY | Electric |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 1,732 | 1,714
Total revenues | 1,770 | 1,797
Operating Segments | CECONY | Electric | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 38 | 83
Operating Segments | CECONY | Gas |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 833 | 910
Total revenues | 834 | 921
Operating Segments | CECONY | Gas | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 1 | 11
Operating Segments | CECONY | Steam |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 245 | 317
Total revenues | 250 | 321
Operating Segments | CECONY | Steam | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 5 | 4
Operating Segments | O&R |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 221 | 257
Total revenues | 233 | 258
Operating Segments | O&R | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 12 | 1
Operating Segments | O&R | Electric |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 128 | 143
Total revenues | 136 | 145
Operating Segments | O&R | Electric | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 8 | 2
Operating Segments | O&R | Gas |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 93 | 114
Total revenues | 97 | 113
Operating Segments | O&R | Gas | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 4 | (1)
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Total revenues | 0 | (1)
Other | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | $ 0 | $ (1)

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