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GENERAL INFORMATION AND OTHER FINANCIAL DATA - INVENTORIES (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Inventory [Line Items] |  |  |
Natural gas | $ 21 | $ 95 |
LNG | 7 | 4 |
Materials and supplies | 161 | 159 |
Inventory | 189 | 258 | [1]
SDG&E [Member] |  |  |
Inventory [Line Items] |  |  |
Natural gas | 0 | 0 |
LNG | 0 | 0 |
Materials and supplies | 99 | 102 |
Inventory | 99 | 102 |
SoCalGas [Member] |  |  |
Inventory [Line Items] |  |  |
Natural gas | 12 | 92 |
LNG | 0 | 0 |
Materials and supplies | 46 | 42 |
Inventory | 58 | 134 |
Sempra Mexico [Member] |  |  |
Inventory [Line Items] |  |  |
Natural gas | 0 | 0 |
LNG | 7 | 4 |
Materials and supplies | 16 | 15 |
Inventory | 23 | 19 |
Sempra LNG [Member] |  |  |
Inventory [Line Items] |  |  |
Natural gas | 9 | 3 |
LNG | 0 | 0 |
Materials and supplies | 0 | 0 |
Inventory | $ 9 | $ 3 |
[1] | Derived from audited financial statements.

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