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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | $ 13,456 | $ 12,026 | $ 12,144
Revenues | 13,676 | 12,246 | 12,574
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 220 | 220 | 430
CECONY |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 11,716 | 10,647 | 10,821
CECONY | Decoupling Mechanisms |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 48 |  |
CECONY | EAMs |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 34 |  |
CECONY | LPCs |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 74 |  |
O&R | Decoupling Mechanisms |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (18) |  |
O&R | EAMs |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2 |  |
O&R | LPCs |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 4 |  |
Operating Segments | Clean Energy Businesses |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 917 | 661 | 646
Revenues | 1,022 | 736 | 857
Operating Segments | Clean Energy Businesses | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 105 | 75 | 211
Operating Segments | Clean Energy Businesses | Renewables |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 683 | 609 | 575
Revenues | 683 | 609 | 575
Operating Segments | Clean Energy Businesses | Renewables | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 0 | 0
Operating Segments | Clean Energy Businesses | Energy services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 234 | 52 | 71
Revenues | 234 | 52 | 71
Operating Segments | Clean Energy Businesses | Energy services | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 0 | 0
Operating Segments | Clean Energy Businesses | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Revenues | 105 | 75 | 211
Operating Segments | Clean Energy Businesses | Other | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 105 | 75 | 211
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 | 11,579 | 10,518 | 10,620
Revenues | 11,716 | 10,647 | 10,821
Operating Segments | CECONY | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 137 | 129 | 201
Operating Segments | CECONY | Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 8,736 | 8,026 | 7,913
Revenues | 8,806 | 8,103 | 8,062
Operating Segments | CECONY | Electric | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 70 | 77 | 149
Operating Segments | CECONY | Gas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 2,324 | 1,998 | 2,097
Revenues | 2,378 | 2,036 | 2,132
Operating Segments | CECONY | Gas | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 54 | 38 | 35
Operating Segments | CECONY | Steam |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 519 | 494 | 610
Revenues | 532 | 508 | 627
Operating Segments | CECONY | Steam | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 13 | 14 | 17
Operating Segments | O&R |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 956 | 843 | 874
Revenues | 941 | 862 | 893
Operating Segments | O&R | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (15) | 19 | 19
Operating Segments | O&R | Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 691 | 619 | 627
Revenues | 681 | 629 | 634
Operating Segments | O&R | Electric | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (10) | 10 | 7
Operating Segments | O&R | Gas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 265 | 224 | 247
Revenues | 260 | 233 | 259
Operating Segments | O&R | Gas | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (5) | 9 | 12
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Revenues | (7) | (3) | (1)
Other | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (7) | (3) | (1)
Other | O&R |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 0 | $ 0 | $ 0

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