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Financial Information by Business Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 3,220 | $ 2,944 | $ 7,495 | $ 7,347
Depreciation and amortization | 512 | 496 | 1,051 | 994
Operating income (loss) | 320 | 284 | 1,331 | 2,022
CECONY |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 2,996 | 2,744 | 6,967 | 6,697
Depreciation and amortization | 482 | 470 | 993 | 943
Operating income (loss) | 314 | 262 | 1,304 | 1,071
CECONY | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 482 | 470 | 993 | 943
Operating income (loss) | 314 | 262 | 1,304 | 1,071
CECONY | Electric | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 345 | 339 | 715 | 683
Operating income (loss) | 272 | 232 | 512 | 424
CECONY | Gas | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 112 | 106 | 226 | 211
Operating income (loss) | 85 | 83 | 701 | 642
CECONY | Steam | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 25 | 25 | 52 | 49
Operating income (loss) | (43) | (53) | 91 | 5
O&R | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 29 | 26 | 58 | 51
Operating income (loss) | 9 | 11 | 64 | 52
O&R | Electric | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 20 | 18 | 40 | 36
Operating income (loss) | 12 | 13 | 25 | 14
O&R | Gas | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 9 | 8 | 18 | 15
Operating income (loss) | (3) | (2) | 39 | 38
Operating segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 3,220 | 2,944 | 7,495 | 7,347
Operating segment | Clean Energy Businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues |  |  | 0 | 129
Depreciation and amortization |  |  | 0 | 0
Operating income (loss) |  |  | 0 | 37
Operating segment | Con Edison Transmission |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1 | 1 | 2 | 2
Depreciation and amortization | 0 | 0 | 1 | 0
Operating income (loss) | (2) | (2) | (5) | (4)
Operating segment | CECONY | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 2,996 | 2,744 | 6,967 | 6,697
Operating segment | CECONY | Electric | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 2,370 | 2,144 | 4,812 | 4,500
Operating segment | CECONY | Gas | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 538 | 531 | 1,781 | 1,822
Operating segment | CECONY | Steam | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 88 | 69 | 374 | 375
Operating segment | O&R | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 224 | 200 | 527 | 521
Operating segment | O&R | Electric | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 180 | 159 | 370 | 341
Operating segment | O&R | Gas | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 44 | 41 | 157 | 180
Inter-segment | CECONY | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (26) | (25) | (52) | (50)
Inter-segment | CECONY | Electric | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 5 | 5 | 10 | 9
Inter-segment | CECONY | Gas | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 3 | 2 | 5 | 4
Inter-segment | CECONY | Steam | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 18 | 18 | 37 | 37
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (1) | (1) | (1) | (2)
Depreciation and amortization | 1 | 0 | (1) | 0
Operating income (loss) | $ (1) | $ 13 | $ (32) | $ 866

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