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QUARTERLY FINANCIAL DATA (UNAUDITED) - NARRATIVE (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | [1] | Sep. 30, 2018
Significant Items Affecting Quarterly Results [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of assets | $ 513,000,000 |  |  |  |  |  |  | $ 524,000,000 | $ 3,000,000 | [1] | $ 134,000,000 |
Gain on sale of assets, net of tax | 367,000,000 |  |  |  |  |  |  |  |  |  |  |
Total increase in income tax expense due to tax cuts and jobs act |  |  | $ 870,000,000 |  |  |  |  | 85,000,000 | 870,000,000 |  |  |
Write-off of wildfire regulatory asset |  |  |  |  |  |  |  | 0 | 351,000,000 | [1] | 0 |
San Diego Gas and Electric Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Items Affecting Quarterly Results [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total increase in income tax expense due to tax cuts and jobs act |  |  |  |  |  |  |  | 0 | 28,000,000 |  |  |
Write-off of wildfire regulatory asset |  |  |  |  |  |  |  | 0 | 351,000,000 | [1] | $ 0 |
Termoelectrica de Mexicali [Member] | Sempra Mexico [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Items Affecting Quarterly Results [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment in investment |  |  |  |  | $ 71,000,000 | $ 71,000,000 | $ 131,000,000 |  |  |  |  |
Other than temporary impairment in investment, net of tax and noncontrolling interest |  |  |  |  | $ 47,000,000 |  |  |  |  |  |  |
Loss from Catastrophes [Member] | San Diego Gas and Electric Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Items Affecting Quarterly Results [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Write-off of wildfire regulatory asset |  |  |  | $ 351,000,000 |  |  |  |  | 351,000,000 |  |  |
Write-off of wildfire regulatory asset net of tax |  |  |  | $ 208,000,000 |  |  |  |  | $ 208,000,000 |  |  |
Disposal Group Held-for-sale [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Items Affecting Quarterly Results [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  | $ (1,500,000,000) |  |  |  |  |  |  |  |  |  |
Asset impairment charges, net of taxes and noncontrolling interests |  | (900,000,000) |  |  |  |  |  |  |  |  |  |
Disposal Group Held-for-sale [Member] | Sempra LNG & Midstream [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Items Affecting Quarterly Results [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges | 183,000,000 | (1,300,000,000) |  |  |  |  |  | (1,100,000,000) |  |  |  |
Asset impairment charges, net of taxes and noncontrolling interests | $ 126,000,000 | (755,000,000) |  |  |  |  |  | $ (629,000,000) |  |  |  |
Disposal Group Held-for-sale [Member] | Sempra Renewables [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Items Affecting Quarterly Results [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  | (200,000,000) |  |  |  |  |  |  |  |  |  |
Asset impairment charges, net of taxes and noncontrolling interests |  | $ (145,000,000) |  |  |  |  |  |  |  |  |  |
R B S Sempra Commodities [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Items Affecting Quarterly Results [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investment in RBS Sempra Commodities |  |  |  |  |  |  |  |  |  |  |  | $ 65,000,000
[1] | As adjusted for the retrospective adoption of ASU 2017-07, which we discuss in Note 2, and a reclassification to conform to current year presentation, which we discuss in Note 1.

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