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INVESTMENTS IN UNCONSOLIDATED ENTITIES - NARRATIVE (Details) $ in Millions |  | 1 Months Ended | 10 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 15, 2017 | Sep. 30, 2018 USD ($) | Feb. 28, 2017 USD ($) | Dec. 31, 2018 USD ($) MT Bcf | Dec. 31, 2018 USD ($) MT Bcf | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Mar. 09, 2018 | Nov. 14, 2017 | Sep. 26, 2016 | Sep. 25, 2016 | May 31, 2016 | May 09, 2016 | Mar. 31, 2016 USD ($) | Mar. 29, 2016 | Jun. 30, 2015 USD ($) | Nov. 30, 2014 USD ($) | Oct. 01, 2014 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Undistributed earnings of equity method investments |  |  |  | $ 332 | $ 332 | $ 89 |  |  |  |  |  |  |  |  |  |  |  |
Undistributed earnings, equity method investments, over 50 percent owned |  |  |  |  | 221 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument converted |  |  |  |  | 0 | 19 | $ 0 |  |  |  |  |  |  |  |  |  |  |
Equity method investment |  |  |  | 9,652 | 9,652 | 0 |  |  |  |  |  |  |  |  |  |  |  |
Interest costs capitalized |  |  |  |  | 202 | $ 256 | 236 |  |  |  |  |  |  |  |  |  |  |
Fair value at origin guarantee obligation associated with cash flow requirements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 82
Current guarantor obligations |  |  |  | $ 9 | $ 9 |  |  |  |  |  |  |  |  |  |  |  |  |
R B S Sempra Commodities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment |  | $ 65 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cameron LNG [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in equity method investee |  |  |  | 50.20% | 50.20% |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold for canceling of hedge, Percent of unamortized principal |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Indirect economic and beneficial and ownership interest prior to financial completion |  |  |  | 37.65% | 37.65% |  |  |  |  |  |  |  |  |  |  |  |  |
Indirect economic and beneficial and ownership interest after financial completion |  |  |  | 10.00% | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Cameron LNG [Member] | Other Long Term Debt, Due July 2030 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations, Maximum Exposure, Percentage |  |  |  | 50.20% | 50.20% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maximum borrowing amount |  |  |  | $ 3,900 | $ 3,900 |  |  |  |  |  |  |  |  |  |  |  |  |
Sempra Energy and Other [Member] | R B S Sempra Commodities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in equity method investee |  |  |  | 49.00% | 49.00% | 49.00% |  |  |  |  |  |  |  |  |  |  |  |
Sempra Mexico [Member] | IEnova Pipelines [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired percentage interest |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |
Ownership percentage in equity method investee |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |
Sempra Mexico [Member] | IMG [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments |  |  |  |  | $ 80 | $ 72 | 100 |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in equity method investee |  |  |  | 40.00% | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Transportation service contract term |  |  |  |  | 25 years |  |  |  |  |  |  |  |  |  |  |  |  |
Sempra Mexico [Member] | TransCanada [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in equity method investee |  |  |  | 60.00% | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Sempra Mexico [Member] | DEN [Member] | IEnova Pipelines [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in equity method investee |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |
Sempra Renewables [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments |  |  |  |  | $ 5 |  | 18 |  |  |  |  |  |  |  |  |  |  |
Sempra Renewables [Member] | Wind Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment |  |  |  |  | 200 |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment |  |  |  | $ 291 | 291 |  |  |  |  |  |  |  |  |  |  |  |  |
Sempra LNG & Midstream [Member] | Rockies Express [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in equity method investee |  |  |  |  |  |  |  |  |  |  |  | 25.00% | 25.00% | 25.00% | 25.00% |  |  |
Equity method investment |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 484 |  |  |  |
Sempra LNG & Midstream [Member] | Cameron LNG [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments |  |  |  |  | $ 228 | 1 |  |  |  |  |  |  |  |  |  |  |  |
Proved developed reserves | Bcf |  |  |  | 1.5 | 1.5 |  |  |  |  |  |  |  |  |  |  |  |  |
Project capacity | MT |  |  |  | 13.9 | 13.9 |  |  |  |  |  |  |  |  |  |  |  |  |
Proved undeveloped reserve | MT |  |  |  | 12 | 12 |  |  |  |  |  |  |  |  |  |  |  |  |
Proved undeveloped reserve per day | Bcf |  |  |  | 1.7 | 1.7 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest costs capitalized |  |  |  |  | $ 47 | 47 | $ 47 |  |  |  |  |  |  |  |  |  |  |
Debt amount |  |  |  | $ 7,400 | $ 7,400 |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of debt hedged by interest rate derivatives |  |  |  | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500 | $ 3,700 |
Sempra LNG & Midstream [Member] | LIBOR [Member] | Cameron LNG [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average rate prior to project completion |  |  |  | 1.59% | 1.59% |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average rate after project completion |  |  |  | 1.78% | 1.78% |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed percentage interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.32% | 3.19% |
Corporate Joint Venture [Member] | Sempra South American Utilities [Member] | Eletrans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments |  |  |  |  |  | $ 1 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument converted |  |  | $ 19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Project Partners [Member] | Cameron LNG [Member] | Other Long Term Debt, Due July 2030 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations, Maximum Exposure, Percentage |  |  |  | 49.80% | 49.80% |  |  |  |  |  |  |  |  |  |  |  |  |
Ductos Energéticos del Norte [Member] | Sempra Mexico [Member] | IEnova [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in consolidated entity | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired percentage interest | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in equity method investee |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |
Oncor Holdings Electric Delivery Company LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired percentage interest |  |  |  |  |  |  |  | 80.25% |  |  |  |  |  |  |  |  |  |
Net income/earnings |  |  |  | $ 371 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments |  |  |  |  | $ 230 |  |  |  |  |  |  |  |  |  |  |  |  |
Oncor Electric Delivery Company LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired percentage interest |  |  |  |  |  |  |  | 80.25% |  |  |  |  |  |  |  |  |  |
Oncor Electric Delivery Company LLC [Member] | Sempra Texas Holdings Corp [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired percentage interest |  |  |  |  |  |  |  | 80.03% |  |  |  |  |  |  |  |  |  |

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