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Revenue (Summary of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenue | $ 2,815 | $ 2,965 | $ 5,379 | $ 5,428
Southern California Edison |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 2,680 |  | 5,408 |
Alternative revenue programs and other operating revenue | 123 |  | (51) |
Total operating revenue | 2,803 | 2,953 | 5,357 | 5,409
Southern California Edison | Earning Activities |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 1,534 |  | 3,070 |
Alternative revenue programs and other operating revenue | 1 |  | (22) |
Total operating revenue | 1,535 | 1,584 | 3,048 | 3,136
Southern California Edison | Cost- Recovery Activities |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 1,146 |  | 2,338 |
Alternative revenue programs and other operating revenue | 122 |  | (29) |
Total operating revenue | $ 1,268 | $ 1,369 | $ 2,309 | $ 2,273

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