OTHER FINANCIAL DATA - OTHER NONCONTROLLING INTERESTS (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Noncontrolling Interest [Line Items]
Noncontrolling interests	$ 2,285	$ 2,270	[1]
San Diego Gas and Electric Company [Member] | Otay Mesa VIE [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	100.00%	100.00%
Noncontrolling interests	$ 39	$ 37
Sempra South American Utilities [Member] | Chilquinta Energía subsidiaries [Member]
Noncontrolling Interest [Line Items]
Noncontrolling interests	$ 23	$ 22
Sempra South American Utilities [Member] | Chilquinta Energía subsidiaries [Member] | Minimum [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	22.90%	23.10%
Sempra South American Utilities [Member] | Chilquinta Energía subsidiaries [Member] | Maximum [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	43.40%	43.40%
Sempra South American Utilities [Member] | Luz del Sur [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	16.40%	16.40%
Noncontrolling interests	$ 182	$ 173
Sempra South American Utilities [Member] | Tecsur [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	9.80%	9.80%
Noncontrolling interests	$ 4	$ 4
Sempra Mexico [Member] | IEnova [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	33.60%	33.60%
Noncontrolling interests	$ 1,531	$ 1,524
Sempra Renewables [Member] | Tax equity arrangement – wind [Member]
Noncontrolling Interest [Line Items]
Noncontrolling interests	93	92
Sempra Renewables [Member] | Tax equity arrangement – solar [Member]
Noncontrolling Interest [Line Items]
Noncontrolling interests	$ 371	$ 376
Sempra LNG & Midstream [Member] | Bay Gas Storage Company, Ltd. [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	9.10%	9.10%
Noncontrolling interests	$ 27	$ 27
Sempra LNG & Midstream [Member] | Liberty Gas Storage, LLC [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	23.30%	23.30%
Noncontrolling interests	$ 14	$ 14
Sempra LNG & Midstream [Member] | Southern Gas Transmission Company [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	49.00%	49.00%
Noncontrolling interests	$ 1	$ 1

[1] Derived from audited financial statements.