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Revenue (Summary of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total operating revenue | $ 3,741 |  | $ 4,269 | $ 9,377 | $ 9,648 |
Southern California Edison |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers | 3,884 |  | 4,106 | 8,642 | 9,514 |
Alternative revenue programs and other operating revenue | (152) |  | 154 | 706 | 103 |
Total operating revenue | 3,732 |  | 4,260 | 9,348 | 9,617 |
Receivables related to contracts from customers | 1,500 |  |  | 1,500 |  | $ 1,100
Accrued unbilled revenues | 638 |  |  | 638 |  | 482
Franchise fees billed to customers | 42 |  | 48 | 95 | 104 |
Southern California Edison | CPUC | 2018 GRC |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Reduction in revenue |  | $ 265 |  |  |  |
Southern California Edison | CPUC | 2018 base rate revenue requirement |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Final decision |  |  |  |  |  | $ 5,116
Southern California Edison | CPUC | 2019 base rate revenue requirement |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Final decision |  |  |  | 5,451 |  |
Southern California Edison | Earning Activities |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers | 1,862 |  | 1,851 | 4,896 | 4,921 |
Alternative revenue programs and other operating revenue | (30) |  | (74) | 23 | (96) |
Total operating revenue | 1,832 |  | 1,777 | 4,919 | 4,825 |
Southern California Edison | Cost- Recovery Activities |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues from contracts with customers | 2,022 |  | 2,255 | 3,746 | 4,593 |
Alternative revenue programs and other operating revenue | (122) |  | 228 | 683 | 199 |
Total operating revenue | $ 1,900 |  | $ 2,483 | $ 4,429 | $ 4,792 |

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130533-203044 + Details
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