OTHER FINANCIAL DATA - INVENTORIES (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Inventory [Line Items]
Natural gas	$ 52	$ 92
Liquefied natural gas	15	9
Materials and supplies	172	157
Total	239	258	[1]
SDG&E [Member]
Inventory [Line Items]
Natural gas	1	2
Liquefied natural gas	0	0
Materials and supplies	88	78
Total	89	80
SoCalGas [Member]
Inventory [Line Items]
Natural gas	0	11
Liquefied natural gas	0	0
Materials and supplies	45	47
Total	45	58
Sempra South American Utilities [Member]
Inventory [Line Items]
Natural gas	0	0
Liquefied natural gas	0	0
Materials and supplies	33	27
Total	33	27
Sempra Mexico [Member]
Inventory [Line Items]
Natural gas	0	0
Liquefied natural gas	12	6
Materials and supplies	2	1
Total	14	7
Sempra Renewables [Member]
Inventory [Line Items]
Natural gas	0	0
Liquefied natural gas	0	0
Materials and supplies	4	4
Total	4	4
Sempra LNG & Midstream [Member]
Inventory [Line Items]
Natural gas	51	79
Liquefied natural gas	3	3
Materials and supplies	0	0
Total	54	82
Southern California Gas Company [Member]
Inventory [Line Items]
Total	$ 45	$ 58	[1]

[1] Derived from audited financial statements.