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Financial Information by Business Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 2,719 | $ 2,744 | $ 5,953 | $ 6,258
Depreciation and amortization | 476 | 418 | 946 | 831
Operating income/(loss) | 479 | 458 | 1,287 | 1,244
Clean Energy Businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 57 | 58 | 115 | 116
Operating income/(loss) | 82 | 72 | 96 | 83
Con Edison Transmission |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 0 | 0 | 0 | 0
Operating income/(loss) | (1) | (2) | (3) | (3)
Electric |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization |  |  | 946 | 831
Operating income/(loss) |  |  | 1,287 | 1,244
CECONY |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 2,345 | 2,331 | 5,200 | 5,371
Depreciation and amortization | 396 | 339 | 786 | 673
Operating income/(loss) | 389 | 376 | 1,132 | 1,101
CECONY | Electric |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 301 | 261 | 598 | 518
Operating income/(loss) | 318 | 314 | 600 | 571
CECONY | Gas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 72 | 56 | 143 | 111
Operating income/(loss) | 105 | 94 | 474 | 438
CECONY | Steam |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 23 | 22 | 45 | 44
Operating income/(loss) | (34) | (32) | 58 | 92
O&R |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 23 | 21 | 45 | 42
Operating income/(loss) | 10 | 13 | 65 | 67
O&R | Electric |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 16 | 15 | 32 | 30
Operating income/(loss) | 13 | 16 | 27 | 31
O&R | Gas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 7 | 6 | 13 | 12
Operating income/(loss) | (3) | (3) | 38 | 36
Operating segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 2,719 | 2,744 |  |
Operating segment | Clean Energy Businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 198 | 233 | 344 | 450
Operating segment | Con Edison Transmission |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1 | 1 | 2 | 2
Operating segment | Electric |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues |  |  | 5,953 | 6,258
Operating segment | CECONY |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 2,345 | 2,331 | 5,200 | 5,371
Operating segment | CECONY | Electric |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1,845 | 1,833 | 3,616 | 3,630
Operating segment | CECONY | Gas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 416 | 408 | 1,250 | 1,330
Operating segment | CECONY | Steam |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 84 | 90 | 334 | 411
Operating segment | O&R |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 175 | 179 | 408 | 437
Operating segment | O&R | Electric |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 138 | 138 | 274 | 283
Operating segment | O&R | Gas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 37 | 41 | 134 | 154
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 0 | 0 | (1) | (2)
Depreciation and amortization | 0 | 0 | 0 | 0
Operating income/(loss) | (1) | (1) | (3) | (4)
Inter-segment | Electric |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues |  |  | 0 | 0
Inter-segment | CECONY |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (25) | (23) | (50) | (47)
Inter-segment | CECONY | Electric |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 4 | 5 | 9 | 9
Inter-segment | CECONY | Gas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 2 | 2 | 3 | 3
Inter-segment | CECONY | Steam |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 19 | $ 16 | $ 38 | $ 35

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