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ACQUISTION AND DIVESTITURE ACTIVITY - ASSETS HELD FOR SALE (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 25, 2018 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Feb. 29, 2016 MW | Jun. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Feb. 28, 2019 USD ($) | Feb. 07, 2019 USD ($) | Feb. 06, 2019 USD ($) | Jan. 01, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment |  | $ 9,652,000,000 |  |  |  |  |  | $ 9,652,000,000 | $ 0 |  |  |  |  |
Disposal Group Held-for-sale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  | $ (1,500,000,000) |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges, net of taxes and noncontrolling interests |  |  | (900,000,000) |  |  |  |  |  |  |  |  |  |  |
Sempra Mexico [Member] | Termoelectrica de Mexicali [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Generating capacity (in mw) | MW |  |  |  |  | 625 |  |  |  |  |  |  |  |  |
Other than temporary impairment in investment |  |  |  | $ 71,000,000 |  | $ 71,000,000 | $ 131,000,000 |  |  |  |  |  |  |
Other than temporary impairment in investment, net of tax |  |  |  |  |  |  | $ 111,000,000 |  |  |  |  |  |  |
Deferred tax expense |  |  |  |  |  |  |  |  | $ (8,000,000) | $ 8,000,000 |  |  |  |
Sempra LNG & Midstream [Member] | Disposal Group Held-for-sale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [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) |  |  |  |  |  |
Proceeds from sale |  | 5,000,000 |  |  |  |  |  | 5,000,000 |  |  |  |  |  |
Sempra LNG & Midstream [Member] | Disposal Group Held-for-sale [Member] | Non-utility Natural gas Storage Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges | $ (1,300,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges, net of taxes and noncontrolling interests | $ (755,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Held for Sale, Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | 0 |  |  |  |  |  | 0 |  |  |  |  |  |
Accounts receivable – trade, net |  | 5,000,000 |  |  |  |  |  | 5,000,000 |  |  |  |  |  |
Accounts receivable – other, net |  | 0 |  |  |  |  |  | 0 |  |  |  |  |  |
Other current assets |  | 6,000,000 |  |  |  |  |  | 6,000,000 |  |  |  |  |  |
Property, plant and equipment, net |  | 324,000,000 |  |  |  |  |  | 324,000,000 |  |  |  |  |  |
Other noncurrent assets |  | 1,000,000 |  |  |  |  |  | 1,000,000 |  |  |  |  |  |
Total assets held for sale |  | 336,000,000 |  |  |  |  |  | 336,000,000 |  |  |  |  |  |
Assets Held for Sale, Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable |  | 2,000,000 |  |  |  |  |  | 2,000,000 |  |  |  |  |  |
Other current liabilities |  | 3,000,000 |  |  |  |  |  | 3,000,000 |  |  |  |  |  |
Asset retirement obligations |  | 8,000,000 |  |  |  |  |  | 8,000,000 |  |  |  |  |  |
Total liabilities held for sale |  | 13,000,000 |  |  |  |  |  | 13,000,000 |  |  |  |  |  |
Sempra Renewables [Member] | Wind Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment |  | 291,000,000 |  |  |  |  |  | 291,000,000 |  |  |  |  |  |
Sempra Renewables [Member] | Disposal Group Held-for-sale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  | (200,000,000) |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges, net of taxes and noncontrolling interests |  |  | $ (145,000,000) |  |  |  |  |  |  |  |  |  |  |
Sempra Renewables [Member] | Disposal Group Held-for-sale [Member] | Wind and Solar Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Held for Sale, Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | 7,000,000 |  |  |  |  |  | 7,000,000 |  |  |  |  |  |
Accounts receivable – trade, net |  | 2,000,000 |  |  |  |  |  | 2,000,000 |  |  |  |  |  |
Accounts receivable – other, net |  | 1,000,000 |  |  |  |  |  | 1,000,000 |  |  |  |  |  |
Other current assets |  | 1,000,000 |  |  |  |  |  | 1,000,000 |  |  |  |  |  |
Property, plant and equipment, net |  | 366,000,000 |  |  |  |  |  | 366,000,000 |  |  |  |  |  |
Other noncurrent assets |  | 0 |  |  |  |  |  | 0 |  |  |  |  |  |
Total assets held for sale |  | 377,000,000 |  |  |  |  |  | 377,000,000 |  |  |  |  |  |
Assets Held for Sale, Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable |  | 2,000,000 |  |  |  |  |  | 2,000,000 |  |  |  |  |  |
Other current liabilities |  | 4,000,000 |  |  |  |  |  | 4,000,000 |  |  |  |  |  |
Asset retirement obligations |  | 6,000,000 |  |  |  |  |  | 6,000,000 |  |  |  |  |  |
Total liabilities held for sale |  | 12,000,000 |  |  |  |  |  | 12,000,000 |  |  |  |  |  |
Sempra Renewables [Member] | Disposal Group Held-for-sale [Member] | Wind Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges, net of taxes and noncontrolling interests |  |  |  |  |  |  |  | (145,000,000) |  |  |  |  |  |
Noncontrolling Tax Equity Investors, Wind [Member] | Subsequent Event [Member] | Disposal Group Disposed of by Sale [Member] | Sempra Renewables [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  |  |  |  |  |  |  | $ 551,000,000 |  |  |
Sempra LNG & Midstream [Member] | Disposal Group Disposed of by Sale [Member] | Mississippi Hub And Bay Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Held for Sale, Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets held for sale |  | $ 323,000,000 |  |  |  |  |  | $ 323,000,000 |  |  |  |  |  |
Sempra LNG & Midstream [Member] | Subsequent Event [Member] | Disposal Group Disposed of by Sale [Member] | Mississippi Hub And Bay Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  |  |  |  |  |  |  |  | $ 328,000,000 |  | $ 332,000,000
Bay Gas [Member] | Sempra LNG & Midstream [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,000,000 |
Ownership percentage in equity method investee |  |  |  |  |  |  |  |  |  |  |  |  | 9.10% |

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