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SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - INVENTORIES (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Inventory [Line Items] |  |
Natural gas | $ 95 | $ 109
LNG | 4 | 11
Materials and supplies | 197 | 187
Inventories | 296 | 307
SDG&E [Member] |  |
Inventory [Line Items] |  |
Natural gas | 0 | 4
LNG | 0 | 0
Materials and supplies | 102 | 101
Inventories | 102 | 105
SoCalGas [Member] |  |
Inventory [Line Items] |  |
Natural gas | 92 | 75
LNG | 0 | 0
Materials and supplies | 42 | 49
Inventories | 134 | 124
Sempra South American Utilities [Member] |  |
Inventory [Line Items] |  |
Natural gas | 0 | 0
LNG | 0 | 0
Materials and supplies | 38 | 30
Inventories | 38 | 30
Sempra Mexico [Member] |  |
Inventory [Line Items] |  |
Natural gas | 0 | 0
LNG | 4 | 7
Materials and supplies | 15 | 2
Inventories | 19 | 9
Sempra Renewables [Member] |  |
Inventory [Line Items] |  |
Natural gas | 0 | 0
LNG | 0 | 0
Materials and supplies | 0 | 5
Inventories | 0 | 5
Sempra LNG & Midstream [Member] |  |
Inventory [Line Items] |  |
Natural gas | 3 | 30
LNG | 0 | 4
Materials and supplies | 0 | 0
Inventories | $ 3 | $ 34

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