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INVESTMENTS IN UNCONSOLIDATED ENTITIES - SUMMARY OF INVESTMENTS (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment |  | $ 9,652 | $ 0 |  |  |
Other investments |  | 2,337 | 2,527 |  |  |
Goodwill |  | 2,373 | 2,397 |  | $ 2,364 |
Equity earnings, before income tax |  | (236) | 34 |  | 6 |
Equity earnings (losses), net of tax |  | 412 | 42 |  | 78 |
Total equity earnings |  | 176 | 76 | [1] | 84 | [1]
Cameron LNG Holdings [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Difference between carrying amount of equity method investment and underlying equity |  | 284 | 237 |  |  |
R B S Sempra Commodities [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Other than temporary impairment | $ 65 |  |  |  |  |
Other Equity Method Investments [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Other investments |  | 2,326 | 2,517 |  |  |
Other Equity Method Investments [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Other investments |  | $ 11 | $ 10 |  |  |
Sempra Texas Intermediate Holding Company LLC [Member] | Oncor Holdings Electric Delivery Company LLC [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage in equity method investee |  | 100.00% | 0.00% |  |  |
Equity method investment |  | $ 9,652 | $ 0 |  |  |
Difference between carrying amount of equity method investment and underlying equity |  | 2,814 |  |  |  |
Equity method investment, difference between carrying amount and underlying equity, aoci |  | 69 |  |  |  |
Equity method investment, difference between carrying amount and underlying equity, tax sharing liability |  | 123 |  |  |  |
Equity earnings (losses), net of tax |  | $ 371 | $ 0 |  | 0 |
Sempra South American Utilities [Member] | Eletrans [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage in equity method investee |  | 50.00% | 50.00% |  |  |
Other investments |  | $ 17 | $ 16 |  |  |
Equity earnings (losses), net of tax |  | $ 1 | $ 4 |  | 3 |
Sempra Renewables [Member] | California Solar Partnership [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage in equity method investee |  | 0.00% | 50.00% |  |  |
Other investments |  | $ 0 | $ 107 |  |  |
Equity earnings, before income tax |  | $ 8 | $ 7 |  | 7 |
Sempra Renewables [Member] | Copper Mountain Solar 3 [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage in equity method investee |  | 0.00% | 50.00% |  |  |
Other investments |  | $ 0 | $ 44 |  |  |
Equity earnings, before income tax |  | $ 8 | $ 8 |  | 8 |
Sempra Renewables [Member] | Broken Bow 2 Wind [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage in equity method investee |  | 0.00% | 50.00% |  |  |
Other investments |  | $ 0 | $ 32 |  |  |
Equity earnings, before income tax |  | $ (2) | $ (2) |  | (2) |
Sempra Renewables [Member] | Cedar Creek 2 Wind Farm [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage in equity method investee |  | 50.00% | 50.00% |  |  |
Other investments |  | $ 69 | $ 72 |  |  |
Equity earnings, before income tax |  | $ (1) | $ (2) |  | (2) |
Sempra Renewables [Member] | Flat Ridge 2 Wind Farm [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage in equity method investee |  | 50.00% | 50.00% |  |  |
Other investments |  | $ 82 | $ 255 |  |  |
Other than temporary impairment in investment |  | 169 |  |  |  |
Equity earnings, before income tax |  | $ (178) | $ (13) |  | (7) |
Sempra Renewables [Member] | Fowler Ridge 2 Wind Farm [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage in equity method investee |  | 50.00% | 50.00% |  |  |
Other investments |  | $ 45 | $ 44 |  |  |
Equity earnings, before income tax |  | $ 3 | $ 4 |  | 4 |
Sempra Renewables [Member] | Mehoopany Wind Farm [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage in equity method investee |  | 50.00% | 50.00% |  |  |
Other investments |  | $ 57 | $ 89 |  |  |
Other than temporary impairment in investment |  | 31 |  |  |  |
Equity earnings, before income tax |  | $ (30) | $ (1) |  | 0 |
Sempra Renewables [Member] | Copper Mountain Solar 2 [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage in equity method investee |  | 0.00% | 50.00% |  |  |
Other investments |  | $ 0 | $ 35 |  |  |
Equity earnings, before income tax |  | $ 5 | $ 5 |  | 6 |
Sempra Renewables [Member] | Mesquite Solar 1 [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage in equity method investee |  | 0.00% | 50.00% |  |  |
Other investments |  | $ 0 | $ 81 |  |  |
Equity earnings, before income tax |  | $ 18 | $ 18 |  | 17 |
Sempra Renewables [Member] | Auwahi Wind [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage in equity method investee |  | 50.00% | 50.00% |  |  |
Other investments |  | $ 38 | $ 42 |  |  |
Equity earnings, before income tax |  | 3 | 5 |  | 4 |
Sempra Renewables [Member] | Other Equity Method Investments [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Other investments |  | 0 | 12 |  |  |
Equity earnings, before income tax |  | $ (3) | $ 0 |  | (1) |
Sempra LNG & Midstream [Member] | Cameron LNG Holdings [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage in equity method investee |  | 50.20% | 50.20% |  |  |
Other investments |  | $ 1,271 | $ 997 |  |  |
Equity earnings, before income tax |  | 0 | 5 |  | (2) |
Sempra LNG & Midstream [Member] | Rockies Express [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity earnings, before income tax |  | $ 0 | $ 0 |  | (26) |
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% |  |  |
Other investments |  | $ 0 | $ 67 |  |  |
Equity earnings, before income tax |  | (67) | 0 |  | 0 |
Sempra Mexico [Member] | Ductos Energéticos del Norte [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity earnings (losses), net of tax |  | $ 0 | $ (13) |  | 5 |
Sempra Mexico [Member] | Energia Sierra Juarez Wind Project [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage in equity method investee |  | 50.00% | 50.00% |  |  |
Other investments |  | $ 43 | $ 39 |  |  |
Difference between carrying amount of equity method investment and underlying equity |  | 12 |  |  |  |
Equity earnings (losses), net of tax |  | 2 | 0 |  | 6 |
Sempra Mexico [Member] | IEnova Pipelines [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity earnings (losses), net of tax |  | $ 0 | $ 0 |  | 64 |
Sempra Mexico [Member] | IMG [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage in equity method investee |  | 40.00% | 40.00% |  |  |
Other investments |  | $ 328 | $ 221 |  |  |
Difference between carrying amount of equity method investment and underlying equity |  | 5 |  |  |  |
Equity earnings (losses), net of tax |  | $ 29 | $ 45 |  | 0 |
Sempra Mexico [Member] | TAG [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage in equity method investee |  | 50.00% | 50.00% |  |  |
Other investments |  | $ 376 | $ 364 |  |  |
Difference between carrying amount of equity method investment and underlying equity |  | 130 |  |  |  |
Equity earnings (losses), net of tax |  | 9 | $ 6 |  | $ 0 |
Sempra Texas Holdings Corp [Member] | Oncor Holdings Electric Delivery Company LLC [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Goodwill |  | $ 2,868 |  |  |  |
[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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