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Financial Information by Business Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 3,365 | $ 3,328 | $ 9,623 | $ 9,388
Depreciation and amortization | 421 | 360 | 1,253 | 1,061
Operating income/(loss) | 867 | 826 | 2,111 | 2,007
Clean Energy Businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 53 | 18 | 169 | 55
Operating income/(loss) | 100 | 25 | 183 | 59
Con Edison Transmission |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 0 | 0 | 1 | 1
Operating income/(loss) | (1) | (2) | (5) | (5)
CECONY |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 2,877 | 2,899 | 8,248 | 8,121
Depreciation and amortization | 346 | 322 | 1,020 | 949
Operating income/(loss) | 723 | 764 | 1,825 | 1,850
CECONY | Electric |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 266 | 248 | 785 | 732
Operating income/(loss) | 803 | 850 | 1,374 | 1,421
CECONY | Gas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 58 | 52 | 168 | 152
Operating income/(loss) | (24) | (34) | 414 | 369
CECONY | Steam |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 22 | 22 | 67 | 65
Operating income/(loss) | (56) | (52) | 37 | 60
O&R |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 22 | 19 | 63 | 57
Operating income/(loss) | 46 | 42 | 113 | 110
O&R | Electric |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 16 | 14 | 46 | 41
Operating income/(loss) | 56 | 52 | 88 | 79
O&R | Gas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 6 | 5 | 17 | 16
Operating income/(loss) | (10) | (10) | 25 | 31
Operating segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 3,365 | 3,328 | 9,623 | 9,388
Operating segment | Clean Energy Businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 247 | 181 | 696 | 573
Operating segment | Con Edison Transmission |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1 | 1 | 3 | 3
Operating segment | CECONY |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 2,877 | 2,899 | 8,248 | 8,121
Operating segment | CECONY | Electric |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 2,544 | 2,571 | 6,174 | 6,107
Operating segment | CECONY | Gas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 275 | 264 | 1,605 | 1,540
Operating segment | CECONY | Steam |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 58 | 64 | 469 | 474
Operating segment | O&R |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 241 | 246 | 678 | 691
Operating segment | O&R | Electric |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 210 | 212 | 493 | 505
Operating segment | O&R | Gas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 31 | 34 | 185 | 186
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (1) | 1 | (2) | 0
Depreciation and amortization | 0 | 1 | 0 | (1)
Operating income/(loss) | (1) | (3) | (5) | (7)
Inter-segment | CECONY |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (24) | (25) | (71) | (74)
Inter-segment | CECONY | Electric |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 4 | 4 | 13 | 12
Inter-segment | CECONY | Gas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 2 | 2 | 6 | 6
Inter-segment | CECONY | Steam |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 18 | $ 19 | $ 52 | $ 56

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