GENERAL INFORMATION AND OTHER FINANCIAL DATA - OTHER NONCONTROLLING INTERESTS (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Noncontrolling Interest [Line Items]
Other noncontrolling interests	$ 1,974	$ 2,090	[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%
Other noncontrolling interests	$ 103	$ 100
Sempra Mexico [Member] | IEnova [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	33.40%	33.50%
Other noncontrolling interests	$ 1,637	$ 1,592
Sempra Mexico [Member] | Ownership Interests Held By Others, IEnova, Subsidiary One [Member]
Noncontrolling Interest [Line Items]
Other noncontrolling interests	$ 13	$ 13
Sempra Mexico [Member] | Ownership Interests Held By Others, IEnova, Subsidiary One [Member] | Minimum [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	10.00%	10.00%
Sempra Mexico [Member] | Ownership Interests Held By Others, IEnova, Subsidiary One [Member] | Maximum [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	47.60%	49.00%
Sempra Renewables [Member] | Tax equity arrangement – wind [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	0.00%
Other noncontrolling interests	$ 0	$ 158
Sempra Renewables [Member] | PXISE Energy Solutions LLC [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	11.10%	11.10%
Other noncontrolling interests	$ 0	$ 1
Sempra LNG [Member] | Bay Gas Storage Company, Ltd. [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	0.00%	9.10%
Other noncontrolling interests	$ 0	$ 18
Sempra LNG [Member] | Liberty Gas Storage, LLC [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	24.60%	24.60%
Other noncontrolling interests	$ (12)	$ (12)
Sempra South American Utilities [Member] | Chilquinta Energía subsidiaries [Member]
Noncontrolling Interest [Line Items]
Other noncontrolling interests	$ 24	$ 23
Sempra South American Utilities [Member] | Chilquinta Energía subsidiaries [Member] | Minimum [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	19.70%	19.70%
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%
Other noncontrolling interests	$ 205	$ 193
Sempra South American Utilities [Member] | Tecsur [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	9.80%	9.80%
Other noncontrolling interests	$ 4	$ 4

[1] Derived from audited financial statements.