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SAN ONOFRE NUCLEAR GENERATING STATION (SONGS) - ASSET RETIREMENT OBLIGATION AND SPENT NUCLEAR FUEL (Details) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 18, 2016 | Jul. 31, 2018 | May 31, 2017 | May 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |  |  |
Decrease in regulatory balancing account |  |  |  |  | $ (263) | $ (108) | $ (198)
San Diego Gas and Electric Company [Member] |  |  |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |  |  |
Decommissioning liability |  |  |  |  | 626 |  |
Cost study estimate decommissioning escalated |  |  |  |  | 810 |  |
Decrease in regulatory balancing account |  |  |  |  | $ (138) | $ (56) | $ (35)
San Diego Gas and Electric Company [Member] | Total Ownership [Member] |  |  |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |  |  |
Spent nuclear fuel damages awarded | $ 162 |  |  |  |  |  |
San Diego Gas and Electric Company [Member] | San Onofre Nuclear Generating Station (SONGS) [Member] |  |  |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |  |  |
Spent nuclear fuel damages awarded |  |  |  | $ 32 |  |  |
Decrease in regulatory asset |  |  |  | (23) |  |  |
Decrease in regulatory balancing account |  |  |  | (8) |  |  |
Decrease in SONGS O&M cost balancing account |  |  |  | $ (1) |  |  |
Proceeds from Legal Settlements |  | $ 9 | $ 9 |  |  |  |

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- Definition Increase (Decrease) In Operation And Maintenance Cost Balancing Account. + References No definition available. + Details
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- Definition The increase (decrease) during the reporting period in the asset created by the regulatory convention in which costs and revenues associated with certain utility expenses (such as fuel) are accumulated but on which no return is earned. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition The increase (decrease) during the reporting period in the value of assets that are created when regulatory agencies permits public utilities to defer costs (revenues) to the balance sheet. This element is a the increase (decrease) of regulatory assets and liabilities combined. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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