INVESTMENTS IN UNCONSOLIDATED ENTITIES - SUMMARY OF INVESTMENTS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ 12,440	$ 11,519
Other investments	1,388	2,103
Goodwill	1,602	1,602
Equity earnings, before income tax	294	30	$ (236)
Equity earnings (losses), net of tax	721	550	411
Total equity earnings	1,015	580	175
Distributions from investments	1,462	256	212
Return of investment	761	9	10
Other Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Other investments	1,387	2,097
Other Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Other investments	1	6
R B S Sempra Commodities [Member]
Schedule of Equity Method Investments [Line Items]
Total equity earnings	(100)
Sempra Texas Intermediate Holding Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Distributions from investments	$ 286	$ 246	149
Sempra Texas Intermediate Holding Company LLC [Member] | Oncor Electric Delivery Holdings Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in equity method investee	100.00%	100.00%
Equity method investment	$ 12,440	$ 11,519
Difference between carrying amount of equity method investment and underlying equity	2,833	2,823
Goodwill	2,868	2,868
Equity method investment, difference between carrying amount and underlying equity, aoci	69	69
Equity method investment, difference between carrying amount and underlying equity, tax sharing liability	104	114
Equity earnings (losses), net of tax	$ 577	$ 526	371
Sempra Texas Intermediate Holding Company LLC [Member] | Sharyland Holdings, LP [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in equity method investee	50.00%	50.00%
Equity method investment	$ 102	$ 100
Difference between carrying amount of equity method investment and underlying equity	42
Equity earnings, before income tax	3	2	0
Sempra Mexico [Member]
Schedule of Equity Method Investments [Line Items]
Distributions from investments	$ 8	$ 2	0
Sempra Mexico [Member] | Energia Sierra Juarez Wind Project [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in equity method investee	50.00%	50.00%
Other investments	$ 34	$ 39
Difference between carrying amount of equity method investment and underlying equity	12
Equity earnings (losses), net of tax	$ 5	$ 2	2
Sempra Mexico [Member] | IMG [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in equity method investee	40.00%	40.00%
Other investments	$ 440	$ 337
Difference between carrying amount of equity method investment and underlying equity	5
Equity earnings (losses), net of tax	$ 103	$ 9	29
Sempra Mexico [Member] | TAG [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in equity method investee	50.00%	50.00%
Other investments	$ 378	$ 365
Difference between carrying amount of equity method investment and underlying equity	130
Equity earnings (losses), net of tax	36	13	9
Sempra Renewables [Member]
Schedule of Equity Method Investments [Line Items]
Distributions from investments	0	1	63
Sempra Renewables [Member] | Other Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings, before income tax	0	2	(3)
Sempra Renewables [Member] | Auwahi Wind [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings, before income tax	0	0	3
Sempra Renewables [Member] | Broken Bow 2 Wind [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings, before income tax	0	0	(2)
Sempra Renewables [Member] | Cedar Creek 2 Wind Farm [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings, before income tax	0	0	(1)
Sempra Renewables [Member] | Flat Ridge 2 Wind Farm [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings, before income tax	0	(3)	(178)
Sempra Renewables [Member] | Fowler Ridge 2 Wind Farm [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings, before income tax	0	5	3
Sempra Renewables [Member] | Mehoopany Wind Farm [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings, before income tax	0	1	(30)
Sempra Renewables [Member] | California Solar Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings, before income tax	0	0	8
Sempra Renewables [Member] | Copper Mountain Solar 2 [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings, before income tax	0	0	5
Sempra Renewables [Member] | Copper Mountain Solar 3 [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings, before income tax	0	0	8
Sempra Renewables [Member] | Mesquite Solar 1 [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings, before income tax	0	0	18
Sempra LNG [Member]
Schedule of Equity Method Investments [Line Items]
Distributions from investments	$ 1,168	$ 0	0
Sempra LNG [Member] | Cameron LNG Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in equity method investee	50.20%	50.20%
Other investments	$ 433	$ 1,256
Difference between carrying amount of equity method investment and underlying equity	259	263
Sempra LNG [Member] | Cameron LNG Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings, before income tax	391	24	0
Sempra Energy and Other [Member]
Schedule of Equity Method Investments [Line Items]
Distributions from investments	0	7	0
Sempra Energy and Other [Member] | Other Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings, before income tax	0	(1)	0
Sempra Energy and Other [Member] | R B S Sempra Commodities [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings, before income tax	$ (100)	$ 0	$ (67)