SAN ONOFRE NUCLEAR GENERATING STATION - NUCLEAR INSURANCE (Details) - San Diego Gas and Electric Company [Member] - USD ($) $ in Millions |
Apr. 05, 2018 |
Mar. 31, 2018 |
Jan. 09, 2018 |
Jan. 05, 2018 |
Jan. 04, 2018 |
|---|---|---|---|---|---|
| Schedule Of Nuclear Insurance [Line Items] | |||||
| Maximum nuclear liability insurance coverage | $ 450.0 | $ 100.0 | $ 450.0 | ||
| Maximum secondary financial protection | 110.0 | ||||
| Annual maximum secondary financial protection contribution by company | 560.0 | ||||
| Federal nuclear property damage insurance, minimum required | 50.0 | $ 1,060.0 | |||
| Nuclear property damage insurance | 1,500.0 | ||||
| Maximum premium assessment under nuclear property damage insurance | 10.4 | ||||
| Maximum nuclear property insurance terrorism coverage | $ 3,240.0 | ||||
| Subsequent Event [Member] | |||||
| Schedule Of Nuclear Insurance [Line Items] | |||||
| Spent nuclear fuel storage insurance | $ 500.0 |