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Financial Information by Business Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 3,415 | $ 2,971 | $ 7,475 | $ 6,648
Depreciation and amortization | 539 | 502 | 1,068 | 1,000
Operating income/(loss) | 387 | 418 | 1,185 | 1,279
Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 2,906 | 2,486 | 6,423 | 5,692
Depreciation and amortization | 455 | 423 | 900 | 838
Operating income/(loss) | 280 | 321 | 991 | 1,108
Clean Energy Businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 59 | 55 | 119 | 114
Operating income/(loss) | 97 | 89 | 143 | 117
Con Edison Transmission |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 0 | 0 | 0 | 1
Operating income/(loss) | (2) | (1) | (5) | (4)
CECONY | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 455 | 423 | 900 | 838
Operating income/(loss) | 280 | 321 | 991 | 1,108
CECONY | Electric | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 338 | 320 | 670 | 635
Operating income/(loss) | 220 | 255 | 390 | 501
CECONY | Gas | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 93 | 80 | 183 | 157
Operating income/(loss) | 100 | 99 | 550 | 538
CECONY | Steam |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income/(loss) |  |  | 51 |
CECONY | Steam | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 24 | 23 | 47 | 46
Operating income/(loss) | (40) | (33) |  | 69
O&R | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 25 | 24 | 48 | 47
Operating income/(loss) | 14 | 11 | 59 | 61
O&R | Electric | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 18 | 17 | 35 | 34
Operating income/(loss) | 16 | 14 | 23 | 22
O&R | Gas | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 7 | 7 | 13 | 13
Operating income/(loss) | (2) | (3) | 36 | 39
Operating segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 3,415 | 2,971 | 7,475 | 6,648
Operating segment | Clean Energy Businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 272 | 291 | 532 | 515
Operating segment | Con Edison Transmission |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1 | 1 | 2 | 2
Operating segment | CECONY | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 2,906 | 2,486 | 6,423 | 5,692
Operating segment | CECONY | Electric | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 2,240 | 1,963 | 4,324 | 3,931
Operating segment | CECONY | Gas | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 582 | 449 | 1,713 | 1,423
Operating segment | CECONY | Steam | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 84 | 74 | 386 | 338
Operating segment | O&R | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 238 | 194 | 522 | 442
Operating segment | O&R | Electric | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 177 | 153 | 342 | 299
Operating segment | O&R | Gas | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 61 | 41 | 180 | 143
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (2) | (1) | (4) | (3)
Depreciation and amortization | 0 | 0 | 1 | 0
Operating income/(loss) | (2) | (2) | (3) | (3)
Inter-segment | CECONY | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (25) | (25) | (50) | (50)
Inter-segment | CECONY | Electric | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 5 | 5 | 9 | 9
Inter-segment | CECONY | Gas | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 2 | 2 | 4 | 4
Inter-segment | CECONY | Steam | Subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 18 | $ 18 | $ 37 | $ 37

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