INVESTMENTS IN UNCONSOLIDATED ENTITIES - NARRATIVE (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended		9 Months Ended
	Jul. 31, 2020	Mar. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Schedule of Equity Method Investments [Line Items]
Distributions from investments					$ 761	$ 9
Equity earnings			$ 326	$ 266	822	485
R B S Sempra Commodities [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings		$ (100)
Sempra Texas Utilities [Member] | Oncor Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Contribution			209	1,236	209	1,236
Commitment to invest				$ 1,067		1,067
Sempra LNG [Member]
Schedule of Equity Method Investments [Line Items]
Maximum exposure under guarantor obligations			4,000		4,000
Sempra LNG [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Equity Method Investments [Line Items]
Maximum exposure under guarantor obligations			979		979
Guarantees, carrying value			6		6
Corporate Joint Venture [Member] | Sempra LNG [Member] | Cameron LNG [Member]
Schedule of Equity Method Investments [Line Items]
Contribution			54		54
Proceeds from dividends received					209
Distributions from investments					803
Investments made during period						77
Capitalized interest						32
Maximum exposure under guarantor obligations			4,000		4,000
Guarantees, carrying value			1		$ 1
Proceeds from related party debt	$ 1,500
Liability cap (as a percent)					130.00%
Liability cap, amount			$ 979		$ 979
Corporate Joint Venture [Member] | Sempra LNG [Member] | Cameron LNG [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Equity Method Investments [Line Items]
Distributions from investments					753
Proceeds from related party debt	$ 753
Oncor Holdings [Member] | Sempra Texas Utilities [Member]
Schedule of Equity Method Investments [Line Items]
Proceeds from dividends received					$ 220	$ 162
Oncor Holdings [Member] | Sempra Texas Holdings Corp [Member] | Sempra Texas Intermediate Holding Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in consolidated entity					100.00%
Oncor Electric Delivery Company LLC. [Member] | Oncor Holdings [Member] | Sempra Texas Utilities [Member]
Schedule of Equity Method Investments [Line Items]
Acquired percentage interest			80.25%		80.25%
Cameron LNG [Member] | Sempra LNG [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in consolidated entity					50.20%
Other Current Liabilities [Member] | R B S Sempra Commodities [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings		25
Deferred Credits and Other [Member] | R B S Sempra Commodities [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings		$ 75