OTHER FINANCIAL DATA - INVENTORIES (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Inventory [Line Items]
Natural gas	$ 39	$ 92
Liquefied natural gas	12	9
Materials and supplies	159	157
Total	210	258	[1]
SDG&E [Member]
Inventory [Line Items]
Natural gas	0	2
Liquefied natural gas	0	0
Materials and supplies	82	78
Total	82	80
SoCalGas [Member]
Inventory [Line Items]
Natural gas	0	11
Liquefied natural gas	0	0
Materials and supplies	43	47
Total	43	58
Sempra South American Utilities [Member]
Inventory [Line Items]
Natural gas	0	0
Liquefied natural gas	0	0
Materials and supplies	28	27
Total	28	27
Sempra Mexico [Member]
Inventory [Line Items]
Natural gas	0	0
Liquefied natural gas	9	6
Materials and supplies	2	1
Total	11	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	39	79
Liquefied natural gas	3	3
Materials and supplies	0	0
Total	42	82
Southern California Gas Company [Member]
Inventory [Line Items]
Total	$ 43	$ 58	[1]

[1] Derived from audited financial statements.