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SAN ONOFRE NUCLEAR GENERATING STATION (SONGS) - NUCLEAR INSURANCE (Details) - San Diego Gas and Electric Company [Member] - USD ($) $ in Millions | Dec. 31, 2018 | Apr. 05, 2018 | Jan. 10, 2018 | Jan. 09, 2018 | Jan. 05, 2018 | Jan. 04, 2018
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Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Maximum required nuclear liability insurance available | $ 450.0 |  |  |  | $ 100.0 | $ 450.0
Maximum secondary financial protection available | 110.0 |  |  |  |  |
Maximum nuclear liability loss coverage per incident | 560.0 |  |  |  |  |
Federal nuclear property damage insurance, minimum required | 1,060.0 |  | $ 50.0 | $ 1,060.0 |  |
Maximum premium assessment under nuclear property damage insurance | 10.4 |  |  |  |  |
Federal Nuclear Property Damage Insurance | 1,500.0 |  |  |  |  |
Spent Nuclear Fuel Storage Insurance |  | $ 500.0 |  |  |  |
Maximum nuclear property insurance terrorism coverage | $ 3,240.0 |  |  |  |  |

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