OTHER FINANCIAL DATA - INVENTORY (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Total Inventory [Line Items]
Energy Related Inventory, Natural Gas in Storage	$ 319	$ 113
Energy Related Inventory, Liquefied Natural Gas	11	8
Energy Related Inventory, Materials And Supplies	142	166
Inventory, Total	472	287	[1]
S D G E Segment [Member]
Total Inventory [Line Items]
Energy Related Inventory, Natural Gas in Storage	6	3
Energy Related Inventory, Liquefied Natural Gas	0	0
Energy Related Inventory, Materials And Supplies	64	83
Inventory, Total	70	86
So Cal Gas Segment [Member]
Total Inventory [Line Items]
Energy Related Inventory, Natural Gas in Storage	192	42
Energy Related Inventory, Liquefied Natural Gas	0	0
Energy Related Inventory, Materials And Supplies	29	27
Inventory, Total	221	69
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	36	40
Inventory, Total	36	40
Sempra Mexico Segment [Member]
Total Inventory [Line Items]
Energy Related Inventory, Natural Gas in Storage	0	0
Energy Related Inventory, Liquefied Natural Gas	6	3
Energy Related Inventory, Materials And Supplies	9	9
Inventory, Total	15	12
Sempra Natural Gas Segment [Member]
Total Inventory [Line Items]
Energy Related Inventory, Natural Gas in Storage	121	68
Energy Related Inventory, Liquefied Natural Gas	5	5
Energy Related Inventory, Materials And Supplies	1	5
Inventory, Total	127	78
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	3	2
Inventory, Total	$ 3	$ 2

[1] Derived from audited financial statements.