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SAN ONOFRE NUCLEAR GENERATING STATION (SONGS) - NARRATIVE (Details) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 13, 2017 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2017 | Dec. 19, 2017 | Feb. 28, 2017
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |  |  |  |
Litigation settlement payable | $ 118 |  |  |  |  |  |  |
Percent of arbitration expenses awarded | 95.00% |  |  |  |  |  |  |
Settlement payable net of arbitration expense | $ 60 |  |  |  |  |  |  |
Regulatory asset, current |  |  | $ 138 |  |  | $ 325 |  |
Regulatory asset, noncurrent |  |  | $ 1,589 |  |  | 1,517 |  |
Period of environmental exit |  |  | 10 years |  |  |  |  |
San Diego Gas and Electric Company [Member] |  |  |  |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |  |  |  |
Litigation settlement payable | 24 |  |  |  |  |  |  |
Settlement payable net of arbitration expense | 12 |  |  |  |  |  |  |
Arbitration expense | 12 |  |  |  |  |  |  |
Legal fees | 11 |  |  |  |  |  |  |
Litigation settlement amount allocated to ratepayers and shareholders | $ 1 |  |  |  |  |  |  |
Regulatory asset threshold to cease rate recovery |  |  |  |  |  |  | $ 152 |
Regulatory asset, current |  |  | $ 123 |  |  | 316 |  |
Regulatory asset, noncurrent |  |  | $ 454 |  |  | $ 451 |  |
Percentage of environmental exit costs incurred |  |  | 20.00% |  |  |  |  |
SONGS mitigation costs remaining |  |  | $ 23 |  |  |  |  |
Nuclear decommissioning trust authorized withdrawal amount |  |  | 455 |  |  |  |  | $ 93
San Diego Gas and Electric Company [Member] | Nuclear Plant Closure [Member] |  |  |  |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |  |  |  |
Regulatory asset threshold to cease rate recovery |  |  |  |  |  |  | $ 775 |
Receivable for nuclear plant closure |  |  | 124 |  |  |  |  |
Regulatory asset, current |  |  | 40 |  |  |  |  |
Regulatory asset, noncurrent |  |  | $ 84 |  |  |  |  |
San Diego Gas and Electric Company [Member] | San Onofre Nuclear Generating Station (SONGS) [Member] |  |  |  |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |  |  |  |
Ownership percentage |  |  | 20.00% |  |  |  |  |
SONGS 1 Decommissioning [Member] |  |  |  |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |  |  |  |
SONGS mitigation costs remaining |  | $ 207 |  |  |  |  |  |
SONGS 1 Decommissioning [Member] | San Diego Gas and Electric Company [Member] |  |  |  |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |  |  |  |
SONGS mitigation costs remaining |  | 41 |  |  |  |  |  |
Environmental exit costs deemed reasonable |  | 3 |  |  |  |  |  |
SONGS 2 and 3 Decommissioning [Member] |  |  |  |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |  |  |  |
SONGS mitigation costs remaining |  | 3,200 |  |  |  |  |  |
Environmental exit costs deemed reasonable |  |  |  | $ 222 | $ 136 |  |  |
SONGS 2 and 3 Decommissioning [Member] | San Diego Gas and Electric Company [Member] |  |  |  |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |  |  |  |
SONGS mitigation costs remaining |  | 638 |  |  |  |  |  |
Environmental exit costs deemed reasonable |  | $ 43 |  |  |  |  |  |

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