OTHER FINANCIAL DATA - INVENTORIES (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Inventory [Line Items]
Natural gas	$ 95	$ 92
Liquefied natural gas	10	9
Materials and supplies	191	157
Total	296	258	[1]
SDG&E [Member]
Inventory [Line Items]
Natural gas	2	2
Liquefied natural gas	0	0
Materials and supplies	95	78
Total	97	80
SoCalGas [Member]
Inventory [Line Items]
Natural gas	50	11
Liquefied natural gas	0	0
Materials and supplies	47	47
Total	97	58
Sempra South American Utilities [Member]
Inventory [Line Items]
Natural gas	0	0
Liquefied natural gas	0	0
Materials and supplies	43	27
Total	43	27
Sempra Mexico [Member]
Inventory [Line Items]
Natural gas	0	0
Liquefied natural gas	7	6
Materials and supplies	2	1
Total	9	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	43	79
Liquefied natural gas	3	3
Materials and supplies	0	0
Total	46	82
Southern California Gas Company [Member]
Inventory [Line Items]
Total	$ 97	$ 58	[1]

[1] Derived from audited financial statements.