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Variable Interest Entities (Textual) (Details) - Southern California Edison | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) $ / shares MW | Mar. 31, 2016 $ / shares | Sep. 30, 2015 USD ($) MW | Sep. 30, 2016 USD ($) $ / shares MW | Sep. 30, 2015 USD ($) MW | Dec. 31, 2015 USD ($) $ / shares
Series K Preferred Stock |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |
Security dividend rate, (as a percent) |  | 5.45% |  |  |  |
Liquidation value (in dollars per share) | $ / shares |  | $ 2,500 |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | SCE Power Purchase Contracts |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |
Power generating capacity (in megawatts) | MW | 4,349 |  | 4,062 | 4,349 | 4,062 |
Payments to unconsolidated VIEs for power purchase contracts | $ 313,000,000 |  | $ 270,000,000 | $ 532,000,000 | $ 451,000,000 |
Variable Interest Entity, Not Primary Beneficiary | Trust I |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |
Common stock | 10,000 |  |  | $ 10,000 |  | $ 10,000
Variable Interest Entity, Not Primary Beneficiary | Trust I | Trust Securities |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |
Security dividend rate, (as a percent) |  |  |  | 5.625% |  |
Liquidation preference | $ 475,000,000 |  |  | $ 475,000,000 |  | $ 475,000,000
Liquidation value (in dollars per share) | $ / shares | $ 25 |  |  | $ 25 |  | $ 25
Common stock | $ 10,000 |  |  | $ 10,000 |  |
Variable Interest Entity, Not Primary Beneficiary | Trust I | Series F Preferred Stock |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |
Security dividend rate, (as a percent) |  |  |  | 5.625% |  |
Liquidation preference | $ 475,000,000 |  |  | $ 475,000,000 |  | $ 475,000,000
Liquidation value (in dollars per share) | $ / shares | $ 2,500 |  |  | $ 2,500 |  |
Variable Interest Entity, Not Primary Beneficiary | Trust II |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |
Common stock | $ 10,000 |  |  | $ 10,000 |  | 10,000
Variable Interest Entity, Not Primary Beneficiary | Trust II | Trust Securities |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |
Security dividend rate, (as a percent) |  |  |  | 5.10% |  |
Liquidation preference | $ 400,000,000 |  |  | $ 400,000,000 |  | $ 400,000,000
Liquidation value (in dollars per share) | $ / shares | $ 25 |  |  | $ 25 |  | $ 25
Variable Interest Entity, Not Primary Beneficiary | Trust II | Series G Preferred Stock |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |
Security dividend rate, (as a percent) |  |  |  | 5.10% |  |
Liquidation preference | $ 400,000,000 |  |  | $ 400,000,000 |  | $ 400,000,000
Liquidation value (in dollars per share) | $ / shares | $ 2,500 |  |  | $ 2,500 |  |
Variable Interest Entity, Not Primary Beneficiary | Trust III |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |
Common stock | $ 10,000 |  |  | $ 10,000 |  | 10,000
Variable Interest Entity, Not Primary Beneficiary | Trust III | Trust Securities |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |
Security dividend rate, (as a percent) |  |  |  | 5.75% |  |
Liquidation preference | $ 275,000,000 |  |  | $ 275,000,000 |  | $ 275,000,000
Liquidation value (in dollars per share) | $ / shares | $ 25 |  |  | $ 25 |  | $ 25
Variable Interest Entity, Not Primary Beneficiary | Trust III | Series H Preferred Stock |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |
Security dividend rate, (as a percent) |  |  |  | 5.75% |  |
Liquidation preference | $ 275,000,000 |  |  | $ 275,000,000 |  | $ 275,000,000
Liquidation value (in dollars per share) | $ / shares | $ 2,500 |  |  | $ 2,500 |  |
Variable Interest Entity, Not Primary Beneficiary | Trust IV |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |
Common stock | $ 10,000 |  |  | $ 10,000 |  | 10,000
Variable Interest Entity, Not Primary Beneficiary | Trust IV | Trust Securities |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |
Security dividend rate, (as a percent) |  |  |  | 5.375% |  |
Liquidation preference | $ 325,000,000 |  |  | $ 325,000,000 |  | $ 325,000,000
Liquidation value (in dollars per share) | $ / shares | $ 25 |  |  | $ 25 |  | $ 25
Variable Interest Entity, Not Primary Beneficiary | Trust IV | Series J Preferred Stock |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |
Security dividend rate, (as a percent) |  |  |  | 0.05% |  |
Liquidation preference | $ 325,000,000 |  |  | $ 325,000,000 |  | $ 325,000,000
Liquidation value (in dollars per share) | $ / shares | $ 2,500 |  |  | $ 2,500 |  |
Variable Interest Entity, Not Primary Beneficiary | Trust V |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |
Common stock | $ 10,000 |  |  | $ 10,000 |  |
Variable Interest Entity, Not Primary Beneficiary | Trust V | Trust Securities |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |
Security dividend rate, (as a percent) |  |  |  | 5.45% |  |
Liquidation preference | $ 300,000,000 |  |  | $ 300,000,000 |  |
Liquidation value (in dollars per share) | $ / shares | $ 25 |  |  | $ 25 |  |
Common stock | $ 10,000 |  |  | $ 10,000 |  |
Variable Interest Entity, Not Primary Beneficiary | Trust V | Series K Preferred Stock |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |
Security dividend rate, (as a percent) |  |  |  | 5.45% |  |
Liquidation preference | $ 300,000,000 |  |  | $ 300,000,000 |  |
Liquidation value (in dollars per share) | $ / shares | $ 2,500 |  |  | $ 2,500 |  |

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