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Summary of Significant Accounting Policies (Inventory) (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2013 Southern California Edison | Dec. 31, 2012 Southern California Edison | May 31, 2013 San Onofre (nuclear) Southern California Edison | May 31, 2013 San Onofre (nuclear) Inventory Southern California Edison
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Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Materials and supplies, and spare parts |  |  | $ 244 | $ 319 |  |
Fuel |  |  | 23 | 21 |  |
Total inventory | 267 | 340 | 267 | 340 |  |
Amount of assets reclassified to a regulatory asset |  |  |  |  | $ 1,521 | $ 100

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