GENERAL INFORMATION AND OTHER FINANCIAL DATA - OTHER NONCONTROLLING INTERESTS (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Noncontrolling Interest [Line Items]
Other noncontrolling interests	$ 1,911	$ 2,090	[1]
Otay Mesa VIE [Member] | San Diego Gas and Electric Company [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	0.00%	100.00%
Other noncontrolling interests	$ 0	$ 100
IEnova [Member] | Sempra Mexico [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	33.40%	33.50%
Other noncontrolling interests	$ 1,676	$ 1,592
IEnova subsidiaries [Member] | Sempra Mexico [Member]
Noncontrolling Interest [Line Items]
Other noncontrolling interests	$ 16	$ 13
IEnova subsidiaries [Member] | Sempra Mexico [Member] | Minimum [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	10.00%	10.00%
IEnova subsidiaries [Member] | Sempra Mexico [Member] | Maximum [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	46.30%	49.00%
Tax equity arrangement – wind [Member] | Sempra Renewables [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	0.00%
Other noncontrolling interests	$ 0	$ 158
PXISE Energy Solutions LLC [Member] | Sempra Renewables [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	0.00%	11.10%
Other noncontrolling interests	$ 0	$ 1
PXISE Energy Solutions LLC [Member] | Parent and Other [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	20.00%
Other noncontrolling interests	$ 1
Bay Gas Storage Company, Ltd. [Member] | Sempra LNG [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	0.00%	9.10%
Other noncontrolling interests	$ 0	$ 18
Liberty Gas Storage, LLC [Member] | Sempra LNG [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	24.60%	24.60%
Other noncontrolling interests	$ (13)	$ (12)
ECA LNG Proposed Liquefaction Project [Member] | Sempra LNG [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	16.70%	0.00%
Other noncontrolling interests	$ 3	$ 0
Discontinued Operations, Held-for-sale [Member] | Chilquinta Energía subsidiaries [Member]
Noncontrolling Interest [Line Items]
Other noncontrolling interests	$ 23	$ 23
Discontinued Operations, Held-for-sale [Member] | Chilquinta Energía subsidiaries [Member] | Minimum [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	19.70%	19.70%
Discontinued Operations, Held-for-sale [Member] | Chilquinta Energía subsidiaries [Member] | Maximum [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	43.40%	43.40%
Discontinued Operations, Held-for-sale [Member] | Luz del Sur [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	16.40%	16.40%
Other noncontrolling interests	$ 200	$ 193
Discontinued Operations, Held-for-sale [Member] | Tecsur [Member]
Noncontrolling Interest [Line Items]
Percent ownership held by noncontrolling interests	9.80%	9.80%
Other noncontrolling interests	$ 5	$ 4

[1] Derived from audited financial statements.