SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - INVENTORIES (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Inventory [Line Items] | ||
| LIFO liquidation | $ 33 | |
| Natural gas | 92 | $ 149 |
| LNG | 9 | 6 |
| Materials and supplies | 157 | 143 |
| Inventories | 258 | 298 |
| SDG&E [Member] | ||
| Inventory [Line Items] | ||
| Natural gas | 2 | 6 |
| LNG | 0 | 0 |
| Materials and supplies | 78 | 69 |
| Inventories | 80 | 75 |
| SoCalGas [Member] | ||
| Inventory [Line Items] | ||
| Natural gas | 11 | 49 |
| LNG | 0 | 0 |
| Materials and supplies | 47 | 30 |
| Inventories | 58 | 79 |
| Sempra South American Utilities [Member] | ||
| Inventory [Line Items] | ||
| Natural gas | 0 | 0 |
| LNG | 0 | 0 |
| Materials and supplies | 27 | 30 |
| Inventories | 27 | 30 |
| Sempra Mexico [Member] | ||
| Inventory [Line Items] | ||
| Natural gas | 0 | 0 |
| LNG | 6 | 3 |
| Materials and supplies | 1 | 10 |
| Inventories | 7 | 13 |
| Sempra Renewables [Member] | ||
| Inventory [Line Items] | ||
| Natural gas | 0 | 0 |
| LNG | 0 | 0 |
| Materials and supplies | 4 | 3 |
| Inventories | 4 | 3 |
| Sempra LNG and Midstream [Member] | ||
| Inventory [Line Items] | ||
| Natural gas | 79 | 94 |
| LNG | 3 | 3 |
| Materials and supplies | 0 | 1 |
| Inventories | $ 82 | $ 98 |