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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | $ 3,602 | $ 3,157
Total revenues | 3,677 | 3,234
Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 75 | 77
CECONY |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 3,205 | 2,854
Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 3,677 | 3,234
Operating Segments | Clean Energy Businesses |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 176 | 125
Total revenues | 224 | 146
Operating Segments | Clean Energy Businesses | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 48 | 21
Operating Segments | Clean Energy Businesses | Renewables |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 154 | 114
Total revenues | 154 | 114
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 | 22 | 11
Total revenues | 22 | 11
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 | 48 | 21
Operating Segments | Clean Energy Businesses | Other | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 48 | 21
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 | 3,173 | 2,810
Total revenues | 3,205 | 2,854
Operating Segments | CECONY | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 32 | 44
Operating Segments | CECONY | Electric |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 1,966 | 1,732
Total revenues | 1,968 | 1,770
Operating Segments | CECONY | Electric | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 2 | 38
Operating Segments | CECONY | Gas |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 946 | 833
Total revenues | 973 | 834
Operating Segments | CECONY | Gas | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 27 | 1
Operating Segments | CECONY | Steam |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 261 | 245
Total revenues | 264 | 250
Operating Segments | CECONY | Steam | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 3 | 5
Operating Segments | O&R |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 252 | 221
Total revenues | 248 | 233
Operating Segments | O&R | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | (4) | 12
Operating Segments | O&R | Electric |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 144 | 128
Total revenues | 145 | 136
Operating Segments | O&R | Electric | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 1 | 8
Operating Segments | O&R | Gas |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 108 | 93
Total revenues | 103 | 97
Operating Segments | O&R | Gas | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | (5) | 4
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Total revenues | (1) | 0
Other | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | $ (1) | $ 0

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