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INVESTMENTS IN UNCONSOLIDATED ENTITIES - NARRATIVE (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
May 07, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures |  | $ 12,038 |  | $ 11,972
Maximum exposure under guarantor obligations |  | 4,200 |  |
Aggregate carrying value of guarantor obligations |  | 10 |  |
Joint Venture [Member] | Sempra Mexico [Member] | IMG [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investments made during period |  |  | $ 25 |
Joint Venture [Member] | Sempra LNG [Member] | Cameron LNG [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investments made during period |  | 25 | 29 |
Capitalized interest |  | 13 | $ 11 |
Oncor Holdings [Member] | Sempra Energy [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Contribution |  | 56 |  |
Operating Segments [Member] | Sempra LNG [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures |  | 1,255 |  | $ 1,271
Operating Segments [Member] | Wind Investments [Member] | Sempra Renewables [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures |  | 290 |  |
Sempra Energy [Member] | Oncor Holdings [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Dividends |  | 54 |  |
Tax sharing payments |  | $ 3 |  |
Subsequent Event [Member] | Sempra Energy [Member] | Oncor Holdings [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Contribution | $ 56 |  |  |
Dividends | 54 |  |  |
Tax sharing payments | $ 3 |  |  |

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