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Variable Interest Entities (Details) (Southern California Edison, USD $) | 3 Months Ended |  | 1 Months Ended |  |  |  |  |  | 3 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 3 Months Ended
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Mar. 31, 2013 SCE Trust I | Dec. 31, 2012 SCE Trust I | May 31, 2012 SCE Trust I Trust Securities | Mar. 31, 2013 SCE Trust I Trust Securities | Dec. 31, 2012 SCE Trust I Trust Securities | Mar. 31, 2013 SCE Trust I Series F | Dec. 31, 2012 SCE Trust I Series F | May 31, 2012 SCE Trust I Series F | Mar. 31, 2013 SCE Trust II | Jan. 31, 2013 SCE Trust II | Jan. 31, 2013 SCE Trust II Trust Securities | Mar. 31, 2013 SCE Trust II Trust Securities | Jan. 31, 2013 SCE Trust II Series G Preferred Stock | Mar. 31, 2013 SCE Trust II Series G Preferred Stock | Mar. 31, 2013 Variable Interest Entity, Not Primary Beneficiary SCE Power Purchase Contracts MW | Mar. 31, 2012 Variable Interest Entity, Not Primary Beneficiary SCE Power Purchase Contracts MW
Details of projects or entities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Power generating capacity for majority interest (in megawatts) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,578 | 2,014
Payments to unconsolidated VIEs for power purchase contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 98,000,000 | $ 78,000,000
Future power generating capacity for majority interest (in megawatts) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,837 |
Unconsolidated Trust |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidation preference |  |  | 475,000,000 |  |  |  |  |  |  |  | 400,000,000 |  |  |  |  |
Security dividend rate, (as a percent) |  |  | 5.625% |  |  |  |  |  |  |  | 5.10% |  | 5.10% |  |  |
Liquidation value (in dollars per share) |  |  | $ 25 |  |  |  |  | $ 2,500 |  |  | $ 25 |  | $ 2,500 |  |  |
Common stock | 10,000 | 10,000 | 10,000 |  |  |  |  |  | 10,000 | 10,000 |  |  |  |  |  |
Common stock, percentage issued to Southern California Edison |  |  | 100.00% |  |  |  |  |  |  | 100.00% |  |  |  |  |  |
Preference stock |  |  |  | 475,000,000 | 475,000,000 | 475,000,000 | 475,000,000 | 475,000,000 |  |  |  | 400,000,000 | 400,000,000 | 400,000,000 |  |
Dividend income and distributions | $ 7,000,000 |  |  |  |  |  |  |  | $ 4,000,000 |  |  |  |  |  |  |

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