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Revenue Recognition (Tables) | 3 Months Ended
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Mar. 31, 2021
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following table presents, for the three months ended March 31, 2021 and 2020, revenue from contracts with customers as defined in Accounting Standards Codification Topic 606, "Revenue from Contracts with Customers," as well as additional revenue from sources other than contracts with customers, disaggregated by major source.
| For the Three Months Ended March 31, 2021 | For the Three Months Ended March 31, 2020
(Millions of Dollars) | Revenues from contracts with customers |  | Other revenues (a) | Total operating revenues | Revenues from contracts with customers |  | Other revenues (a) | Total operating revenues
CECONY |  |  |  |  |  |  |  |
Electric | $1,966 |  | $2 | $1,968 | $1,732 |  | $38 | $1,770
Gas | 946 |  | 27 | 973 | 833 |  | 1 | 834
Steam | 261 |  | 3 | 264 | 245 |  | 5 | 250
Total CECONY | $3,173 |  | $32 | $3,205 | $2,810 |  | $44 | $2,854
O&R |  |  |  |  |  |  |  |
Electric | 144 |  | 1 | 145 | 128 |  | 8 | 136
Gas | 108 |  | (5) | 103 | 93 |  | 4 | 97
Total O&R | $252 |  | $(4) | $248 | $221 |  | $12 |  | $233
Clean Energy Businesses |  |  |  |  |  |  |  |
Renewables | 154 |  | — |  | 154 | 114 |  | — |  | 114
Energy services | 22 |  | — |  | 22 | 11 |  | — |  | 11
Other | — |  |  | 48 | 48 | — |  |  | 21 | 21
Total Clean Energy Businesses | $176 |  | $48 | $224 | $125 |  | $21 |  | $146
Con Edison Transmission | 1 |  | — |  | 1 | 1 |  | — |  | 1
Other (b) | — |  |  | (1) |  | (1) |  | — |  |  | — |  | — |
Total Con Edison | $3,602 |  | $75 | $3,677 | $3,157 |  | $77 | $3,234
(a) For the Utilities, this includes revenue from alternative revenue programs, such as the revenue decoupling mechanisms under their New York electric and gas rate plans. For the Clean Energy Businesses, this includes revenue from wholesale services. (b) Parent company and consolidation adjustments.
Change in Unbilled Contract and Unearned Revenues |
| 2021 | 2020
(Millions of Dollars) | Unbilled contract revenue (a) | Unearned revenue (b) |  | Unbilled contract revenue (a) | Unearned revenue (b) |
Beginning balance as of January 1, | $11 | $41 |  | $29 | $17 |
Additions (c) | 24 | — |  |  | 14 | — |  |
Subtractions (c) | 13 | 1 | (d) | 18 | 1 | (d)
Ending balance as of March 31, | $22 | $40 |  | $25 | $16 |
(a)Unbilled contract revenue represents accumulated incurred costs and earned profits on contracts (revenue arrangements), which have been recorded as revenue, but have not yet been billed to customers, and which represent contract assets as defined in Topic 606. Substantially all accrued unbilled contract revenue is expected to be collected within one year. Unbilled contract revenue arises from the cost-to-cost method of revenue recognition. Unbilled contract revenue from fixed-price type contracts is converted to billed receivables when amounts are invoiced to customers according to contractual billing terms, which generally occur when deliveries or other performance milestones are completed. (b)Unearned revenue represents a liability for billings to customers in excess of earned revenue, which are contract liabilities as defined in Topic 606. (c)Additions for unbilled contract revenue and subtractions for unearned revenue represent additional revenue earned. Additions for unearned revenue and subtractions for unbilled contract revenue represent billings. Activity also includes appropriate balance sheet classification for the period. (d)Of the subtractions from unearned revenue, $1 million was included in the balances as of January 1, 2021 and 2020.

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 + Details
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