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Variable Interest Entities (Textual) (Details) - Southern California Edison - VIE | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 USD ($) MW | Mar. 31, 2018 USD ($) MW | Dec. 31, 2017 USD ($) $ / shares | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) $ / shares | Dec. 31, 2014 USD ($) $ / shares | Dec. 31, 2013 USD ($) $ / shares | Dec. 31, 2018 USD ($)
SCE Power Purchase Contracts |  |  |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |  |  |
Power generating capacity (in megawatts) | MW | 4,722 | 3,454 |  |  |  |  |  |
Payments to unconsolidated VIEs for power purchase contracts | $ 153,000,000 | $ 143,000,000 |  |  |  |  |  |
Trust II |  |  |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |  |  |
Common stock | 10,000 |  |  |  |  |  | $ 10,000 | $ 10,000
Trust II | Trust Securities |  |  |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |  |  |
Security dividend rate |  |  |  |  |  |  | 5.10% |
Liquidation preference | 400,000,000 |  |  |  |  |  | $ 400,000,000 | 400,000,000
Liquidation value (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 25 |
Common stock |  |  |  |  |  |  | $ 10,000 |
Redemption of trust securities | 10,000 |  |  |  |  |  |  |
Trust II | Series G Preferred Stock |  |  |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |  |  |
Security dividend rate |  |  |  |  |  |  | 5.10% |
Liquidation preference | 400,000,000 |  |  |  |  |  | $ 400,000,000 | 400,000,000
Liquidation value (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 2,500 |
Trust III |  |  |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |  |  |
Common stock | 10,000 |  |  |  |  | $ 10,000 |  | 10,000
Trust III | Trust Securities |  |  |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |  |  |
Security dividend rate |  |  |  |  |  | 5.75% |  |
Liquidation preference | 275,000,000 |  |  |  |  | $ 275,000,000 |  | 275,000,000
Liquidation value (in dollars per share) | $ / shares |  |  |  |  |  | $ 25 |  |
Trust III | Series H Preferred Stock |  |  |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |  |  |
Security dividend rate |  |  |  |  |  | 5.75% |  |
Liquidation preference | 275,000,000 |  |  |  |  | $ 275,000,000 |  | 275,000,000
Liquidation value (in dollars per share) | $ / shares |  |  |  |  |  | $ 2,500 |  |
Trust IV |  |  |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |  |  |
Common stock | 10,000 |  |  |  | $ 10,000 |  |  | 10,000
Trust IV | Trust Securities |  |  |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |  |  |
Security dividend rate |  |  |  |  | 5.375% |  |  |
Liquidation preference | 325,000,000 |  |  |  | $ 325,000,000 |  |  | 325,000,000
Liquidation value (in dollars per share) | $ / shares |  |  |  |  | $ 25 |  |  |
Trust IV | Series J Preferred Stock |  |  |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |  |  |
Security dividend rate |  |  |  |  | 5.375% |  |  |
Liquidation preference | 325,000,000 |  |  |  | $ 325,000,000 |  |  | 325,000,000
Liquidation value (in dollars per share) | $ / shares |  |  |  |  | $ 2,500 |  |  |
Trust V |  |  |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |  |  |
Common stock | 10,000 |  |  | $ 10,000 |  |  |  | 10,000
Trust V | Trust Securities |  |  |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |  |  |
Security dividend rate |  |  |  | 5.45% |  |  |  |
Liquidation preference | 300,000,000 |  |  | $ 300,000,000 |  |  |  | 300,000,000
Liquidation value (in dollars per share) | $ / shares |  |  |  | $ 25 |  |  |  |
Trust V | Series K Preferred Stock |  |  |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |  |  |
Security dividend rate |  |  |  | 5.45% |  |  |  |
Liquidation preference | 300,000,000 |  |  | $ 300,000,000 |  |  |  | 300,000,000
Liquidation value (in dollars per share) | $ / shares |  |  |  | $ 2,500 |  |  |  |
Trust VI |  |  |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |  |  |
Common stock | 10,000 |  | $ 10,000 |  |  |  |  | 10,000
Trust VI | Trust Securities |  |  |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |  |  |
Security dividend rate |  |  | 5.00% |  |  |  |  |
Liquidation preference | 475,000,000 |  | $ 475,000,000 |  |  |  |  | 475,000,000
Liquidation value (in dollars per share) | $ / shares |  |  | $ 25 |  |  |  |  |
Trust VI | Series L Preferred Stock |  |  |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |  |  |
Security dividend rate |  |  | 5.00% |  |  |  |  |
Liquidation preference | $ 475,000,000 |  | $ 475,000,000 |  |  |  |  | $ 475,000,000
Liquidation value (in dollars per share) | $ / shares |  |  | $ 2,500 |  |  |  |  |

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