SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - OTHER NONCONTROLLING INTERESTS (Details) - USD ($) $ in Millions	Dec. 31, 2020	Mar. 30, 2020	Dec. 31, 2019
Noncontrolling Interest [Line Items]
Other noncontrolling interests	$ 1,541		$ 1,856
IEnova [Member] | Sempra Mexico [Member]
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners	29.80%		33.40%
Other noncontrolling interests	$ 1,487		$ 1,608
IEnova subsidiaries [Member] | Sempra Mexico [Member]
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners	17.50%
Other noncontrolling interests	$ 7		$ 15
IEnova subsidiaries [Member] | Sempra Mexico [Member] | Minimum [Member]
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners			10.00%
IEnova subsidiaries [Member] | Sempra Mexico [Member] | Maximum [Member]
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners			46.30%
Liberty Gas Storage [Member] | Sempra LNG [Member]
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners	0.00%	24.60%	24.60%
Other noncontrolling interests	$ 0		$ (13)
ECA LNG JV [Member] | Sempra LNG [Member]
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners	29.00%		16.70%
Other noncontrolling interests	$ 46		$ 12
PXISE Energy Solutions LLC [Member] | Corporate and Other [Member]
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners	20.00%		20.00%
Other noncontrolling interests	$ 1		$ 1
Chilquinta Energia subsidiaries [Member] | Discontinued Operations, Held-for-sale [Member]
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners	0.00%
Other noncontrolling interests	$ 0		$ 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%
Chilquinta Energia subsidiaries [Member] | Discontinued Operations, Held-for-sale [Member] | Maximum [Member]
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners			43.40%
Luz Del Sur [Member] | Discontinued Operations, Held-for-sale [Member]
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners	0.00%		16.40%
Other noncontrolling interests	$ 0		$ 205
Tecsur [Member] | Discontinued Operations, Held-for-sale [Member]
Noncontrolling Interest [Line Items]
Ownership percentage held by noncontrolling owners	0.00%		9.80%
Other noncontrolling interests	$ 0		$ 5