INVESTMENTS IN UNCONSOLIDATED ENTITIES - SUMMARY OF INVESTMENTS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ 11,519	$ 9,652
Other investments	2,103	2,320
Goodwill	1,602	1,602
Equity earnings, before income tax	30	(236)	$ 34
Equity earnings (losses), net of tax	550	411	38
Total equity earnings	580	175	72
Distributions from investments	256	212	65
Cameron LNG Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Difference between carrying amount of equity method investment and underlying equity	263	246
Other Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Other investments	2,097	2,309
Other Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Other investments	6	11
Sempra Texas Intermediate Holding Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Distributions from investments	$ 246	$ 149	0
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%	0.00%
Equity method investment	$ 100	$ 0
Difference between carrying amount of equity method investment and underlying equity	42
Equity earnings, before income tax	$ 2	$ 0	0
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	$ 11,519	$ 9,652
Difference between carrying amount of equity method investment and underlying equity	2,823	2,814
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	114	123
Equity earnings (losses), net of tax	526	371	0
Sempra Mexico [Member]
Schedule of Equity Method Investments [Line Items]
Distributions from investments	2	0	0
Sempra Mexico [Member] | Ductos Energéticos del Norte [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings (losses), net of tax	$ 0	$ 0	(13)
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	$ 39	$ 43
Difference between carrying amount of equity method investment and underlying equity	12	12
Equity earnings (losses), net of tax	$ 2	$ 2	0
Sempra Mexico [Member] | IMG [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in equity method investee	40.00%	40.00%
Other investments	$ 337	$ 328
Difference between carrying amount of equity method investment and underlying equity	5	5
Equity earnings (losses), net of tax	$ 9	$ 29	45
Sempra Mexico [Member] | TAG [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in equity method investee	50.00%	50.00%
Other investments	$ 365	$ 376
Difference between carrying amount of equity method investment and underlying equity	130	130
Equity earnings (losses), net of tax	13	9	6
Sempra Renewables [Member]
Schedule of Equity Method Investments [Line Items]
Distributions from investments	1	63	65
Sempra Renewables [Member] | California Solar Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings, before income tax	0	8	7
Sempra Renewables [Member] | Copper Mountain Solar 3 [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings, before income tax	0	8	8
Sempra Renewables [Member] | Broken Bow 2 Wind [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings, before income tax	$ 0	$ (2)	(2)
Sempra Renewables [Member] | Cedar Creek 2 Wind Farm [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in equity method investee	0.00%	50.00%
Other investments	$ 0	$ 69
Equity earnings, before income tax	$ 0	$ (1)	(2)
Sempra Renewables [Member] | Flat Ridge 2 Wind Farm [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in equity method investee	0.00%	50.00%
Other investments	$ 0	$ 82
Other than temporary impairment in investment		169
Equity earnings, before income tax	$ (3)	$ (178)	(13)
Sempra Renewables [Member] | Fowler Ridge 2 Wind Farm [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in equity method investee	0.00%	50.00%
Other investments	$ 0	$ 45
Equity earnings, before income tax	$ 5	$ 3	4
Sempra Renewables [Member] | Mehoopany Wind Farm [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in equity method investee	0.00%	50.00%
Other investments	$ 0	$ 57
Other than temporary impairment in investment		31
Equity earnings, before income tax	1	(30)	(1)
Sempra Renewables [Member] | Copper Mountain Solar 2 [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings, before income tax	0	5	5
Sempra Renewables [Member] | Mesquite Solar 1 [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings, before income tax	$ 0	$ 18	18
Sempra Renewables [Member] | Auwahi Wind [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in equity method investee	0.00%	50.00%
Other investments	$ 0	$ 38
Equity earnings, before income tax	0	3	5
Sempra Renewables [Member] | Other Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings, before income tax	$ 2	$ (3)	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	$ 1,256	$ 1,271
Equity earnings, before income tax	24	0	5
Sempra Energy and Other [Member]
Schedule of Equity Method Investments [Line Items]
Distributions from investments	7	0	0
Sempra Energy and Other [Member] | R B S Sempra Commodities [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings, before income tax	0	(67)	0
Sempra Energy and Other [Member] | Other Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings, before income tax	$ (1)	$ 0	$ 0