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Financial Information by Business Segment (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |
Total revenues | $ 3,234 | $ 3,514
Depreciation and amortization | 470 | 413
Operating income/(loss) | 808 | 786
Clean Energy Businesses |  |
Segment Reporting Information [Line Items] |  |
Depreciation and amortization | 57 | 58
Operating income/(loss) | 14 | 11
Con Edison Transmission |  |
Segment Reporting Information [Line Items] |  |
Depreciation and amortization | 1 | 0
Operating income/(loss) | (2) | (2)
CECONY |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 2,854 | 3,039
Depreciation and amortization | 390 | 334
Operating income/(loss) | 742 | 726
CECONY | Electric |  |
Segment Reporting Information [Line Items] |  |
Depreciation and amortization | 297 | 257
Operating income/(loss) | 282 | 257
CECONY | Gas |  |
Segment Reporting Information [Line Items] |  |
Depreciation and amortization | 71 | 55
Operating income/(loss) | 369 | 344
CECONY | Steam |  |
Segment Reporting Information [Line Items] |  |
Depreciation and amortization | 22 | 22
Operating income/(loss) | 91 | 125
O&R |  |
Segment Reporting Information [Line Items] |  |
Depreciation and amortization | 22 | 21
Operating income/(loss) | 55 | 54
O&R | Electric |  |
Segment Reporting Information [Line Items] |  |
Depreciation and amortization | 16 | 15
Operating income/(loss) | 14 | 16
O&R | Gas |  |
Segment Reporting Information [Line Items] |  |
Depreciation and amortization | 6 | 6
Operating income/(loss) | 41 | 38
Operating segment |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 3,234 | 3,514
Operating segment | Clean Energy Businesses |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 146 | 217
Operating segment | Con Edison Transmission |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 1 | 1
Operating segment | CECONY |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 2,854 | 3,039
Operating segment | CECONY | Electric |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 1,770 | 1,797
Operating segment | CECONY | Gas |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 834 | 921
Operating segment | CECONY | Steam |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 250 | 321
Operating segment | O&R |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 233 | 258
Operating segment | O&R | Electric |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 136 | 145
Operating segment | O&R | Gas |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 97 | 113
Other |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 0 | (1)
Depreciation and amortization | 0 | 0
Operating income/(loss) | (1) | (3)
Inter-segment | CECONY |  |
Segment Reporting Information [Line Items] |  |
Total revenues | (25) | (24)
Inter-segment | CECONY | Electric |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 4 | 4
Inter-segment | CECONY | Gas |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 2 | 2
Inter-segment | CECONY | Steam |  |
Segment Reporting Information [Line Items] |  |
Total revenues | $ 19 | $ 18

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