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Revenue (Tables) | 9 Months Ended
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Sep. 30, 2021
Revenue from Contract with Customer [Abstract] |
Summary of Revenue | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended September 30, 2021 | ​ | Three months ended September 30, 2020
​ | ​ | ​ | ​ | ​ | Cost- | ​ | ​ | ​ | ​ | ​ | Cost- | ​ | ​
​ | ​ | Earning | ​ | Recovery | ​ | Total | ​ | Earning | ​ | Recovery | ​ | Total
(in millions) |  | Activities |  | Activities | ​ | Consolidated |  | Activities |  | Activities |  | Consolidated
Revenues from contracts with customers1,2 | ​ | $ | 2,260 | ​ | $ | 2,804 | ​ | $ | 5,064 | ​ | $ | 1,893 |  | $ | 2,327 |  | $ | 4,220
Alternative revenue programs and other operating revenue3 | ​ |  | 135 | ​ |  | 94 | ​ |  | 229 | ​ |  | 233 |  | ​ | 182 |  | ​ | 415
Total operating revenue | ​ | $ | 2,395 | ​ | $ | 2,898 | ​ | $ | 5,293 | ​ | $ | 2,126 | ​ | $ | 2,509 | ​ | $ | 4,635
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine months ended September 30, 2021 | ​ | Nine months ended September 30, 2020
​ | ​ | ​ | ​ | ​ | Cost- | ​ | ​ | ​ | ​ | ​ | Cost- | ​ | ​
​ | ​ | Earning | ​ | Recovery | ​ | Total | ​ | Earning | ​ | Recovery | ​ | Total
(in millions) |  | Activities |  | Activities | ​ | Consolidated |  | Activities |  | Activities |  | Consolidated
Revenues from contracts with customers1,2 | ​ | $ | 5,667 | ​ | $ | 5,422 | ​ | $ | 11,089 | ​ | $ | 5,175 |  | $ | 4,265 |  | $ | 9,440
Alternative revenue programs and other operating revenue3 | ​ |  | 325 | ​ |  | 138 | ​ |  | 463 | ​ |  | 467 |  | ​ | 488 |  | ​ | 955
Total operating revenue | ​ | $ | 5,992 | ​ | $ | 5,560 | ​ | $ | 11,552 | ​ | $ | 5,642 | ​ | $ | 4,753 | ​ | $ | 10,395
1 | The revenue requirements in the 2021 GRC final decision are retroactive to January 1, 2021. SCE recorded the impact of the 2021 GRC decision in third quarter of 2021, including $404 million related to the six-month period ended June 30, 2021.
2 | At September 30, 2021 and December 31, 2020, SCE's receivables related to contracts from customers were $2.8 billion and $1.5 billion, respectively, which include accrued unbilled revenue of $1.1 billion and $521 million, respectively.
3 | Includes differences between amounts billed and authorized levels for both the CPUC and FERC.

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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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