SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - OTHER NONCONTROLLING INTERESTS (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Noncontrolling Interest [Line Items]
Other noncontrolling interests	$ 1,856	$ 2,090
Otay Mesa VIE [Member] | SDG&E [Member]
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners	0.00%	100.00%
Other noncontrolling interests	$ 0	$ 100
IEnova [Member] | Sempra Mexico [Member]
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners	33.40%	33.50%
Other noncontrolling interests	$ 1,608	$ 1,592
IEnova subsidiaries | Sempra Mexico [Member]
Noncontrolling Interest [Line Items]
Other noncontrolling interests	$ 15	$ 13
IEnova subsidiaries | Sempra Mexico [Member] | Minimum [Member]
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners	10.00%	10.00%
IEnova subsidiaries | Sempra Mexico [Member] | Maximum [Member]
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners	46.30%	49.00%
Tax equity arrangement – wind [Member] | Sempra Renewables [Member]
Noncontrolling Interest [Line Items]
Other noncontrolling interests	$ 0	$ 158
PXISE Energy Solutions LLC [Member] | Sempra Renewables [Member]
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners		11.10%
Other noncontrolling interests	$ 0	$ 1
PXISE Energy Solutions LLC [Member] | Corporate and Other [Member]
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners	20.00%
Other noncontrolling interests	$ 1	$ 0
Bay Gas Storage Company [Member] | Sempra LNG [Member]
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners	0.00%	9.10%
Other noncontrolling interests	$ 0	$ 18
Liberty Gas Storage [Member] | Sempra LNG [Member]
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners	24.60%	24.60%
Other noncontrolling interests	$ (13)	$ (12)
ECA LNG JV [Member] | Sempra LNG [Member]
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners	16.70%	0.00%
Other noncontrolling interests	$ 12	$ 0
Chilquinta Energia subsidiaries [Member] | Discontinued Operations, Held-for-sale [Member]
Noncontrolling Interest [Line Items]
Other noncontrolling interests	$ 23	$ 23
Chilquinta Energia subsidiaries [Member] | Discontinued Operations, Held-for-sale [Member] | Minimum [Member]
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners	19.70%	19.70%
Chilquinta Energia subsidiaries [Member] | Discontinued Operations, Held-for-sale [Member] | Maximum [Member]
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners	43.40%	43.40%
Luz Del Sur [Member] | Discontinued Operations, Held-for-sale [Member]
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners	16.40%	16.40%
Other noncontrolling interests	$ 205	$ 193
Tecsur [Member] | Discontinued Operations, Held-for-sale [Member]
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners	9.80%	9.80%
Other noncontrolling interests	$ 5	$ 4