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SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - OTHER INTANGIBLE ASSETS (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 298,000,000 |  | $ 298,000,000 | $ 698,000,000 |
Accumulated amortization | (26,000,000) |  | (26,000,000) | (102,000,000) |
Other intangible assets | 272,000,000 |  | 272,000,000 | 596,000,000 |
Intangible assets amortization expense |  |  | 16,000,000 | 18,000,000 | $ 11,000,000
Future intangible asset amortization expense per year |  |  | 12,000,000 |  |
Development rights [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-lived intangible assets, Gross | 0 |  | 0 | 322,000,000 |
Accumulated amortization | 0 |  | $ 0 | (60,000,000) |
Amortization period |  |  | 50 years |  |
Renewable energy and consumption permit [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-lived intangible assets, Gross | 154,000,000 |  | $ 154,000,000 | 154,000,000 |
Accumulated amortization | (16,000,000) |  | $ (16,000,000) | (8,000,000) |
Amortization period |  |  | 19 years |  |
Storage rights [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-lived intangible assets, Gross | 0 |  | $ 0 | 138,000,000 |
Accumulated amortization | 0 |  | $ 0 | (28,000,000) |
Amortization period |  |  | 46 years |  |
O&M agreement [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-lived intangible assets, Gross | 66,000,000 |  | $ 66,000,000 | 66,000,000 |
Accumulated amortization | (3,000,000) |  | $ (3,000,000) | 0 |
Amortization period |  |  | 23 years |  |
Other [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-lived intangible assets, Gross | 28,000,000 |  | $ 28,000,000 | 18,000,000 |
Accumulated amortization | (7,000,000) |  | $ (7,000,000) | (6,000,000) |
Other [Member] | Minimum [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Amortization period |  |  | 10 years |  |
Sempra LNG & Midstream [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Impairment of Intangible Assets, Finite-lived |  |  | $ 369,000,000 |  |
Disposal Group Held-for-sale [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Asset impairment charges |  | $ 1,500,000,000 |  |  |
Disposal Group Held-for-sale [Member] | Sempra LNG & Midstream [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Asset impairment charges | (183,000,000) | $ 1,300,000,000 | 1,100,000,000 |  |
Concession Permits [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) | $ 50,000,000 |  | $ 50,000,000 | $ 0 |

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