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Revenue (Summary of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenue | $ 3,009 | $ 4,269 | $ 2,815 | $ 2,564 | $ 3,220 | $ 3,672 | $ 2,965 | $ 2,463 | $ 12,657 | $ 12,320 | $ 11,869
SCE |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 12,130 |  |
Alternative revenue programs and other operating revenue |  |  |  |  |  |  |  |  | 481 |  |
Total operating revenue | 2,994 | $ 4,260 | $ 2,803 | $ 2,554 | 3,193 | $ 3,652 | $ 2,953 | $ 2,456 | 12,611 | 12,254 | 11,830
Receivables from contracts with customers | 1,100 |  |  |  | 825 |  |  |  | 1,100 | 825 |
Accrued unbilled revenues | $ 482 |  |  |  | $ 212 |  |  |  | 482 | 212 |
SCE | Earning Activities |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 6,519 |  |
Alternative revenue programs and other operating revenue |  |  |  |  |  |  |  |  | 41 |  |
Total operating revenue |  |  |  |  |  |  |  |  | 6,560 | 6,611 | 6,504
SCE | Cost- Recovery Activities |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 5,611 |  |
Alternative revenue programs and other operating revenue |  |  |  |  |  |  |  |  | 440 |  |
Total operating revenue |  |  |  |  |  |  |  |  | $ 6,051 | $ 5,643 | $ 5,326

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044 + Details
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