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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | $ 15,455 | $ 13,456 | $ 12,026
Revenues | 15,670 | 13,676 | 12,246
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 215 | 220 | 220
CECONY |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 13,268 | 11,716 | 10,647
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 | 998 | 917 | 661
Revenues | 1,319 | 1,022 | 736
Operating Segments | Clean Energy Businesses | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 321 | 105 | 75
Operating Segments | Clean Energy Businesses | Renewables |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 637 | 638 | 608
Revenues | 637 | 638 | 608
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 | 317 | 234 | 52
Revenues | 317 | 234 | 52
Operating Segments | Clean Energy Businesses | Energy services | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 0 | 0
Operating Segments | Clean Energy Businesses | Develop/Transfer Projects |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 44 | 45 | 1
Revenues | 44 | 45 | 1
Operating Segments | Clean Energy Businesses | Develop/Transfer Projects | 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 | 321 | 105 | 75
Operating Segments | Clean Energy Businesses | Other | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 321 | 105 | 75
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 | 13,376 | 11,579 | 10,518
Revenues | 13,268 | 11,716 | 10,647
Operating Segments | CECONY | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (108) | 137 | 129
Operating Segments | CECONY | Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 9,917 | 8,736 | 8,026
Revenues | 9,751 | 8,806 | 8,103
Operating Segments | CECONY | Electric | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (166) | 70 | 77
Operating Segments | CECONY | Gas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 2,875 | 2,324 | 1,998
Revenues | 2,924 | 2,378 | 2,036
Operating Segments | CECONY | Gas | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 49 | 54 | 38
Operating Segments | CECONY | Steam |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 584 | 519 | 494
Revenues | 593 | 532 | 508
Operating Segments | CECONY | Steam | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 9 | 13 | 14
Operating Segments | O&R |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 1,077 | 956 | 843
Revenues | 1,085 | 941 | 862
Operating Segments | O&R | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 8 | (15) | 19
Operating Segments | O&R | Electric |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 771 | 691 | 619
Revenues | 773 | 681 | 629
Operating Segments | O&R | Electric | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2 | (10) | 10
Operating Segments | O&R | Gas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 306 | 265 | 224
Revenues | 312 | 260 | 233
Operating Segments | O&R | Gas | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 6 | (5) | 9
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Revenues | (6) | (7) | (3)
Other | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (6) | (7) | (3)
Other | O&R |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 0 | $ 0 | $ 0

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