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Financial Information by Business Segment (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting Information [Line Items] |  |
Total revenues | $ 4,280 | $ 4,403
Depreciation and amortization | 539 | 499
Operating income/(loss) | 1,011 | 1,739
CECONY |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 3,971 | 3,953
Depreciation and amortization | 510 | 473
Operating income/(loss) | 989 | 809
CECONY | Subsidiaries |  |
Segment Reporting Information [Line Items] |  |
Depreciation and amortization | 510 | 473
Operating income/(loss) | 989 | 809
CECONY | Electric | Subsidiaries |  |
Segment Reporting Information [Line Items] |  |
Depreciation and amortization | 370 | 343
Operating income/(loss) | 240 | 194
CECONY | Gas | Subsidiaries |  |
Segment Reporting Information [Line Items] |  |
Depreciation and amortization | 114 | 105
Operating income/(loss) | 615 | 559
CECONY | Steam | Subsidiaries |  |
Segment Reporting Information [Line Items] |  |
Depreciation and amortization | 26 | 25
Operating income/(loss) | 134 | 56
O&R | Subsidiaries |  |
Segment Reporting Information [Line Items] |  |
Depreciation and amortization | 29 | 25
Operating income/(loss) | 56 | 41
O&R | Electric | Subsidiaries |  |
Segment Reporting Information [Line Items] |  |
Depreciation and amortization | 20 | 18
Operating income/(loss) | 14 | 1
O&R | Gas | Subsidiaries |  |
Segment Reporting Information [Line Items] |  |
Depreciation and amortization | 9 | 7
Operating income/(loss) | 42 | 40
Operating segment |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 4,280 | 4,403
Operating segment | Clean Energy Businesses |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 0 | 129
Depreciation and amortization | 0 | 0
Operating income/(loss) | 0 | 36
Operating segment | Con Edison Transmission |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 1 | 1
Depreciation and amortization | 0 | 0
Operating income/(loss) | (3) | (2)
Operating segment | CECONY | Subsidiaries |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 3,971 | 3,953
Operating segment | CECONY | Electric | Subsidiaries |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 2,441 | 2,356
Operating segment | CECONY | Gas | Subsidiaries |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 1,243 | 1,291
Operating segment | CECONY | Steam | Subsidiaries |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 287 | 306
Operating segment | O&R | Subsidiaries |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 308 | 321
Operating segment | O&R | Electric | Subsidiaries |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 195 | 182
Operating segment | O&R | Gas | Subsidiaries |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 113 | 139
Inter-segment | CECONY | Subsidiaries |  |
Segment Reporting Information [Line Items] |  |
Total revenues | (25) | (25)
Inter-segment | CECONY | Electric | Subsidiaries |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 4 | 5
Inter-segment | CECONY | Gas | Subsidiaries |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 2 | 2
Inter-segment | CECONY | Steam | Subsidiaries |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 19 | 18
Other |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 0 | (1)
Depreciation and amortization | 0 | 1
Operating income/(loss) | $ (31) | $ 855

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