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Revenue (Summary of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |
Total operating revenue | $ 2,790 | $ 2,824 |
Accrued unbilled revenue | 409 |  | $ 488
Southern California Edison |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 2,342 | 2,459 |
Alternative revenue programs and other operating revenue | 438 | 357 |
Total operating revenue | 2,780 | 2,816 |
Receivables related to contracts from customers | 1,000 |  | 1,100
Accrued unbilled revenue | 409 |  | $ 488
Southern California Edison | Earning Activities |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 1,624 | 1,502 |
Alternative revenue programs and other operating revenue | 117 | 48 |
Total operating revenue | 1,741 | 1,550 |
Southern California Edison | Cost- Recovery Activities |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 718 | 957 |
Alternative revenue programs and other operating revenue | 321 | 309 |
Total operating revenue | $ 1,039 | $ 1,266 |

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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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