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Financial Information by Business Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 3,333 | $ 3,365 | $ 9,286 | $ 9,623
Depreciation and amortization | 482 | 421 | 1,428 | 1,253
Operating income/(loss) | 860 | 867 | 2,147 | 2,111
Clean Energy Businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 58 | 53 | 173 | 169
Operating income/(loss) | 92 | 100 | 188 | 183
Con Edison Transmission |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 0 | 0 | 1 | 1
Operating income/(loss) | (2) | (1) | (6) | (5)
Electric |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization |  |  | 1,428 | 1,253
Operating income/(loss) |  |  | 2,147 | 2,111
CECONY |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 2,872 | 2,877 | 8,072 | 8,248
Depreciation and amortization | 401 | 346 | 1,187 | 1,020
Operating income/(loss) | 722 | 723 | 1,854 | 1,825
CECONY | Electric |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 305 | 266 | 904 | 785
Operating income/(loss) | 813 | 803 | 1,413 | 1,374
CECONY | Gas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 74 | 58 | 216 | 168
Operating income/(loss) | (34) | (24) | 440 | 414
CECONY | Steam |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 22 | 22 | 67 | 67
Operating income/(loss) | (57) | (56) | 1 | 37
O&R |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 23 | 22 | 67 | 63
Operating income/(loss) | 49 | 46 | 114 | 113
O&R | Electric |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 17 | 16 | 48 | 46
Operating income/(loss) | 58 | 56 | 86 | 88
O&R | Gas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 6 | 6 | 19 | 17
Operating income/(loss) | (9) | (10) | 28 | 25
Operating segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 3,333 | 3,365 |  |
Operating segment | Clean Energy Businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 222 | 247 | 566 | 696
Operating segment | Con Edison Transmission |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1 | 1 | 3 | 3
Operating segment | Electric |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues |  |  | 9,286 | 9,623
Operating segment | CECONY |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 2,872 | 2,877 | 8,072 | 8,248
Operating segment | CECONY | Electric |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 2,562 | 2,544 | 6,178 | 6,174
Operating segment | CECONY | Gas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 259 | 275 | 1,509 | 1,605
Operating segment | CECONY | Steam |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 51 | 58 | 385 | 469
Operating segment | O&R |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 238 | 241 | 647 | 678
Operating segment | O&R | Electric |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 208 | 210 | 483 | 493
Operating segment | O&R | Gas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 30 | 31 | 164 | 185
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 0 | (1) | (2) | (2)
Depreciation and amortization | 0 | 0 | 0 | 0
Operating income/(loss) | (1) | (1) | (3) | (5)
Inter-segment | Electric |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues |  |  | 0 | 0
Inter-segment | CECONY |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (24) | (24) | (74) | (71)
Inter-segment | CECONY | Electric |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 4 | 4 | 13 | 13
Inter-segment | CECONY | Gas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 2 | 2 | 5 | 6
Inter-segment | CECONY | Steam |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 18 | $ 18 | $ 56 | $ 52

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