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Financial Information by Business Segment | 3 Months Ended
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Mar. 31, 2020
Segment Reporting [Abstract] |
Financial Information by Business Segment | Financial Information by Business Segment Con Edison’s principal business segments are CECONY’s regulated utility activities, O&R’s regulated utility activities, the Clean Energy Businesses and Con Edison Transmission. CECONY’s principal business segments are its regulated electric, gas and steam utility activities. The financial data for the business segments for the three months ended March 31, 2020 and 2019 were as follows:
| For the Three Months Ended March 31,
| Operating revenues | Inter-segment revenues | Depreciation and amortization | Operating income/(loss)
(Millions of Dollars) | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019 |
CECONY |  |  |  |  |  |  |  |
Electric | $1,770 | $1,797 | $4 | $4 | $297 | $257 | $282 | $257
Gas | 834 | 921 | 2 | 2 | 71 | 55 | 369 | 344
Steam | 250 | 321 | 19 | 18 | 22 | 22 | 91 | 125
Consolidation adjustments | — |  | — |  | (25) | (24) | — |  | — |  | — |  | — |
Total CECONY | $2,854 | $3,039 |  | $— |  |  | $— |  | $390 | $334 | $742 | $726
O&R |  |  |  |  |  |  |  |
Electric | $136 | $145 |  | $— |  |  | $— |  | $16 | $15 | $14 | $16
Gas | 97 | 113 | — |  | — |  | 6 | 6 | 41 | 38
Total O&R | $233 | $258 |  | $— |  |  | $— |  | $22 | $21 | $55 | $54
Clean Energy Businesses | $146 | $217 |  | $— |  |  | $— |  | $57 | $58 | $14 | $11
Con Edison Transmission | 1 | 1 | — |  | — |  | 1 | — |  | (2) | (2)
Other (a) | — |  | (1) | — |  | — |  | — |  | — |  | (1) | (3)
Total Con Edison | $3,234 | $3,514 |  | $— |  |  | $— |  | $470 | $413 | $808 | $786
(a) Parent company and consolidation adjustments. Other does not represent a business segment.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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