OTHER FINANCIAL DATA - INVENTORY (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Total Inventory [Line Items]
Energy Related Inventory, Natural Gas in Storage	$ 113	$ 246
Energy Related Inventory, Liquefied Natural Gas	14	14
Energy Related Inventory, Materials And Supplies	139	136
Inventory, Total	266	396	[1]
S D G E Segment [Member]
Total Inventory [Line Items]
Energy Related Inventory, Natural Gas in Storage	3	8
Energy Related Inventory, Liquefied Natural Gas	0	0
Energy Related Inventory, Materials And Supplies	64	65
Inventory, Total	67	73
So Cal Gas Segment [Member]
Total Inventory [Line Items]
Energy Related Inventory, Natural Gas in Storage	29	155
Energy Related Inventory, Liquefied Natural Gas	0	0
Energy Related Inventory, Materials And Supplies	28	26
Inventory, Total	57	181
Sempra South American Utilities Segment [Member]
Total Inventory [Line Items]
Energy Related Inventory, Natural Gas in Storage	0	0
Energy Related Inventory, Liquefied Natural Gas	0	0
Energy Related Inventory, Materials And Supplies	35	33
Inventory, Total	35	33
Sempra Mexico Segment [Member]
Total Inventory [Line Items]
Energy Related Inventory, Natural Gas in Storage	0	0
Energy Related Inventory, Liquefied Natural Gas	10	9
Energy Related Inventory, Materials And Supplies	9	9
Inventory, Total	19	18
Sempra Natural Gas Segment [Member]
Total Inventory [Line Items]
Energy Related Inventory, Natural Gas in Storage	81	83
Energy Related Inventory, Liquefied Natural Gas	4	5
Energy Related Inventory, Materials And Supplies	1	1
Inventory, Total	86	89
Sempra Renewables Segment [Member]
Total Inventory [Line Items]
Energy Related Inventory, Natural Gas in Storage	0	0
Energy Related Inventory, Liquefied Natural Gas	0	0
Energy Related Inventory, Materials And Supplies	2	2
Inventory, Total	$ 2	$ 2

[1] Derived from audited financial statements.