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Revenue (Summary of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total operating revenue | $ 2,987 | $ 2,812 | $ 5,777 | $ 5,636 |
Accrued unbilled revenue | 629 |  | 629 |  | $ 488
Southern California Edison |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from contracts with customers | 2,878 | 2,299 | 5,220 | 4,758 |
Alternative revenue programs and other operating revenue | 102 | 501 | 540 | 858 |
Total operating revenue | 2,980 | 2,800 | 5,760 | 5,616 |
Receivables related to contracts from customers | 1,300 |  | 1,300 |  | 1,100
Accrued unbilled revenue | 629 |  | 629 |  | $ 488
Southern California Edison | Earning Activities |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from contracts with customers | 1,658 | 1,532 | 3,282 | 3,034 |
Alternative revenue programs and other operating revenue | 117 | 5 | 234 | 53 |
Total operating revenue | 1,775 | 1,537 | 3,516 | 3,087 |
Southern California Edison | Cost- Recovery Activities |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from contracts with customers | 1,220 | 767 | 1,938 | 1,724 |
Alternative revenue programs and other operating revenue | (15) | 496 | 306 | 805 |
Total operating revenue | $ 1,205 | $ 1,263 | $ 2,244 | $ 2,529 |

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