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SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - TRANSACTIONS WITH AFFILIATES (Details) $ in Millions, $ in Billions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 MXN ($) | Mar. 31, 2016
Related Party Transaction [Line Items] |  |  |  |
Due from unconsolidated affiliates - current | $ 39 | $ 37 |  |
Due from unconsolidated affiliates - noncurrent | 688 | 598 |  |
Due to unconsolidated affiliates - current | (10) | (7) |  |
Due to unconsolidated affiliates, noncurrent | $ (37) | (35) |  |
ESJ joint venture [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction rate | 8.89% |  |  |
TAG Pipeline Norte [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction rate | 5.77% |  |  |
LIBOR [Member] | ESJ joint venture [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Variable percentage rate | 6.375% |  |  |
LIBOR [Member] | TAG Pipeline Norte [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Variable percentage rate | 2.90% |  |  |
Sempra South American Utilities [Member] | Eletrans [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Due from unconsolidated affiliates - noncurrent | $ 43 | 103 |  |
Sempra South American Utilities [Member] | Other related parties [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Due from unconsolidated affiliates - noncurrent | 1 | 1 |  |
Sempra Mexico [Member] | IMG [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Due from unconsolidated affiliates - noncurrent | 641 | 487 |  |
Total facility | 721 |  | $ 14.2 |
Sempra Mexico [Member] | ESJ joint venture [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Due from unconsolidated affiliates - noncurrent | $ 3 | 7 |  |
Sempra Mexico [Member] | TAG Pipeline Norte [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ownership percentage in equity method investee | 50.00% |  | 50.00% |
Due to unconsolidated affiliates, noncurrent | $ (37) | (35) |  |
Sempra Mexico [Member] | Interbank Equilibrium Rate [Member] | IMG [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Variable percentage rate | 2.20% |  |  |
Related party transaction rate | 10.84% |  |  |
San Diego Gas and Electric Company [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Due to unconsolidated affiliates - current | $ (61) | (40) |  |
Total facility | 750 |  |  |
San Diego Gas and Electric Company [Member] | Due to/from Sempra Energy [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Due to unconsolidated affiliates - current | (43) | (30) |  |
Income taxes due from Sempra Energy | 5 | 27 |  |
San Diego Gas and Electric Company [Member] | Due to/from SoCalGas [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Due to unconsolidated affiliates - current | (6) | (4) |  |
San Diego Gas and Electric Company [Member] | Due to/from Various Affiliates [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Due to unconsolidated affiliates - current | (12) | (6) |  |
Southern California Gas Company [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Due from unconsolidated affiliates - current | 7 | 4 |  |
Due to unconsolidated affiliates - current | (34) | (35) |  |
Total facility | 750 |  |  |
Southern California Gas Company [Member] | Due to/from Sempra Energy [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Due to unconsolidated affiliates - current | (34) | (35) |  |
Income taxes due to Sempra Energy | (4) |  |  |
Income taxes due from Sempra Energy |  | 10 |  |
Southern California Gas Company [Member] | Due to/from Various Affiliates [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Due from unconsolidated affiliates - current | 1 | 0 |  |
Southern California Gas Company [Member] | Due to/from SDGE [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Due from unconsolidated affiliates - current | $ 6 | $ 4 |  |
Rockies Express [Member] | Sempra LNG & Midstream [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ownership percentage in equity method investee |  |  |  | 25.00%

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