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Variable Interest Entities (Textual) (Details) - Southern California Edison | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2017 USD ($) | Mar. 31, 2018 USD ($) $ / shares MW | Mar. 31, 2017 USD ($) MW | Dec. 31, 2017 USD ($) $ / shares
Variable Interest Entity |  |  |  |
Redemption of trust securities |  |  | $ 3,000,000 |
Variable Interest Entity, Not Primary Beneficiary | SCE Power Purchase Contracts |  |  |  |
Variable Interest Entity |  |  |  |
Power generating capacity (in megawatts) | MW |  | 3,454 | 4,928 |
Payments to unconsolidated VIEs for power purchase contracts |  | $ 143,000,000 | $ 140,000,000 |
Variable Interest Entity, Not Primary Beneficiary | Trust I |  |  |  |
Variable Interest Entity |  |  |  |
Common stock |  | 10,000 |  |
Variable Interest Entity, Not Primary Beneficiary | Trust I | Trust Securities |  |  |  |
Variable Interest Entity |  |  |  |
Security dividend rate |  |  |  | 5.625%
Liquidation preference | $ 475,000,000 | $ 475,000,000 |  |
Liquidation value (in dollars per share) | $ / shares |  | $ 25 |  | $ 25
Common stock |  |  |  | $ 10,000
Redemption of trust securities | $ 10,000 |  |  |
Variable Interest Entity, Not Primary Beneficiary | Trust I | Series F Preferred Stock |  |  |  |
Variable Interest Entity |  |  |  |
Security dividend rate |  | 5.625% |  |
Liquidation preference |  | $ 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 |  |
Variable Interest Entity, Not Primary Beneficiary | Trust II | Trust Securities |  |  |  |
Variable Interest Entity |  |  |  |
Security dividend rate |  |  |  | 5.10%
Liquidation preference |  | $ 400,000,000 |  | $ 400,000,000
Liquidation value (in dollars per share) | $ / shares |  | $ 25 |  |
Variable Interest Entity, Not Primary Beneficiary | Trust II | Series G Preferred Stock |  |  |  |
Variable Interest Entity |  |  |  |
Security dividend rate |  | 5.10% |  |
Liquidation preference |  | $ 400,000,000 |  | $ 400,000,000
Liquidation value (in dollars per share) | $ / shares |  | $ 2,500 |  |
Variable Interest Entity, Not Primary Beneficiary | Trust III |  |  |  |
Variable Interest Entity |  |  |  |
Common stock |  | $ 10,000 |  |
Variable Interest Entity, Not Primary Beneficiary | Trust III | Trust Securities |  |  |  |
Variable Interest Entity |  |  |  |
Security dividend rate |  |  |  | 5.75%
Liquidation preference |  | $ 275,000,000 |  | $ 275,000,000
Liquidation value (in dollars per share) | $ / shares |  | $ 25 |  |
Variable Interest Entity, Not Primary Beneficiary | Trust III | Series H Preferred Stock |  |  |  |
Variable Interest Entity |  |  |  |
Security dividend rate |  | 5.75% |  |
Liquidation preference |  | $ 275,000,000 |  | $ 275,000,000
Liquidation value (in dollars per share) | $ / shares |  | $ 2,500 |  |
Variable Interest Entity, Not Primary Beneficiary | Trust IV |  |  |  |
Variable Interest Entity |  |  |  |
Common stock |  | $ 10,000 |  |
Variable Interest Entity, Not Primary Beneficiary | Trust IV | Trust Securities |  |  |  |
Variable Interest Entity |  |  |  |
Security dividend rate |  |  |  | 5.375%
Liquidation preference |  | $ 325,000,000 |  | $ 325,000,000
Liquidation value (in dollars per share) | $ / shares |  | $ 25 |  |
Variable Interest Entity, Not Primary Beneficiary | Trust IV | Series J Preferred Stock |  |  |  |
Variable Interest Entity |  |  |  |
Security dividend rate |  | 5.375% |  |
Liquidation preference |  | $ 325,000,000 |  | $ 325,000,000
Liquidation value (in dollars per share) | $ / shares |  | $ 2,500 |  |
Variable Interest Entity, Not Primary Beneficiary | Trust V |  |  |  |
Variable Interest Entity |  |  |  |
Common stock |  | $ 10,000 |  |
Variable Interest Entity, Not Primary Beneficiary | Trust V | Trust Securities |  |  |  |
Variable Interest Entity |  |  |  |
Security dividend rate |  |  |  | 5.45%
Liquidation preference |  | $ 300,000,000 |  | $ 300,000,000
Liquidation value (in dollars per share) | $ / shares |  | $ 25 |  |
Variable Interest Entity, Not Primary Beneficiary | Trust V | Series K Preferred Stock |  |  |  |
Variable Interest Entity |  |  |  |
Security dividend rate |  | 5.45% |  |
Liquidation preference |  | $ 300,000,000 |  | $ 300,000,000
Liquidation value (in dollars per share) | $ / shares |  | $ 2,500 |  |
Variable Interest Entity, Not Primary Beneficiary | Trust VI |  |  |  |
Variable Interest Entity |  |  |  |
Common stock |  | $ 10,000 |  |
Variable Interest Entity, Not Primary Beneficiary | Trust VI | Trust Securities |  |  |  |
Variable Interest Entity |  |  |  |
Security dividend rate |  |  |  | 5.00%
Liquidation preference |  | $ 475,000,000 |  | $ 475,000,000
Liquidation value (in dollars per share) | $ / shares |  | $ 25 |  |
Variable Interest Entity, Not Primary Beneficiary | Trust VI | Series L Preferred Stock |  |  |  |
Variable Interest Entity |  |  |  |
Security dividend rate |  | 5.00% |  |
Liquidation preference |  | $ 475,000,000 |  | $ 475,000,000
Liquidation value (in dollars per share) | $ / shares |  | $ 2,500 |  |

X
- Definition Payments for electricity purchased during the reporting period under power purchase contracts with unconsolidated VIEs. + References No definition available. + Details
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