OTHER FINANCIAL DATA - INVENTORY (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Total Inventory [Line Items]
Energy Related Inventory, Natural Gas in Storage	$ 111	$ 246
Energy Related Inventory, Liquefied Natural Gas	11	14
Energy Related Inventory, Materials And Supplies	133	136
Inventory, Total	255	396	[1]
S D G E Segment [Member]
Total Inventory [Line Items]
Energy Related Inventory, Natural Gas in Storage	6	8
Energy Related Inventory, Liquefied Natural Gas	0	0
Energy Related Inventory, Materials And Supplies	63	65
Inventory, Total	69	73
So Cal Gas Segment [Member]
Total Inventory [Line Items]
Energy Related Inventory, Natural Gas in Storage	83	155
Energy Related Inventory, Liquefied Natural Gas	0	0
Energy Related Inventory, Materials And Supplies	26	26
Inventory, Total	109	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	32	33
Inventory, Total	32	33
Sempra Mexico Segment [Member]
Total Inventory [Line Items]
Energy Related Inventory, Natural Gas in Storage	0	0
Energy Related Inventory, Liquefied Natural Gas	7	9
Energy Related Inventory, Materials And Supplies	9	9
Inventory, Total	16	18
Sempra Natural Gas Segment [Member]
Total Inventory [Line Items]
Energy Related Inventory, Natural Gas in Storage	22	83
Energy Related Inventory, Liquefied Natural Gas	4	5
Energy Related Inventory, Materials And Supplies	1	1
Inventory, Total	27	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.