INVESTMENTS IN UNCONSOLIDATED ENTITIES - NARRATIVE (Details) - USD ($)	1 Months Ended	3 Months Ended
	Jul. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Mar. 19, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Charge to equity earnings		$ (318,000,000)	$ (263,000,000)
Cameron LNG [Member] | Other Long Term Debt, Due July 2030
Schedule of Equity Method Investments [Line Items]
Maximum exposure under guarantor obligations		4,000,000,000.0
R B S Sempra Commodities [Member]
Schedule of Equity Method Investments [Line Items]
Charge to equity earnings			100,000,000
Sempra Texas Utilities [Member] | Oncor Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Contribution		50,000,000	70,000,000
Sempra LNG [Member]
Schedule of Equity Method Investments [Line Items]
Maximum exposure under guarantor obligations		4,000,000,000.0
Sempra LNG [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Equity Method Investments [Line Items]
Maximum exposure under guarantor obligations		979,000,000
Guarantees, carrying value		$ 3,000,000
Sempra Mexico [Member] | IMG [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)		40.00%
Transportation service contract, term		35 years
Foreign currency gains		$ 23,000,000	149,000,000
Corporate Joint Venture [Member] | Sempra LNG [Member] | Cameron LNG [Member]
Schedule of Equity Method Investments [Line Items]
Proceeds from dividends received		$ 131,000,000
Proceeds from related party debt	$ 1,500,000,000
Liability cap (as a percent)		130.00%
Liability cap, amount		$ 979,000,000
Corporate Joint Venture [Member] | Sempra LNG [Member] | Cameron LNG [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Equity Method Investments [Line Items]
Proceeds from related party debt	753,000,000
Distribution from equity method investment	$ 753,000,000
Oncor Holdings [Member] | Sempra Texas Utilities [Member]
Schedule of Equity Method Investments [Line Items]
Proceeds from dividends received		$ 77,000,000	$ 73,000,000
ESJ [Member] | IEnova [Member] | Sempra Mexico [Member]
Schedule of Equity Method Investments [Line Items]
Acquired percentage interest				50.00%
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%
Cameron LNG [Member] | Sempra LNG [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in consolidated entity		50.20%
ESJ [Member] | IEnova [Member] | Sempra Mexico [Member]
Schedule of Equity Method Investments [Line Items]
Percent ownership held by noncontrolling interests					50.00%
ESJ [Member] | ESJ [Member] | IEnova [Member] | Sempra Mexico [Member]
Schedule of Equity Method Investments [Line Items]
Percent ownership held by noncontrolling interests					50.00%
Other Current Liabilities [Member] | R B S Sempra Commodities [Member]
Schedule of Equity Method Investments [Line Items]
Charge to equity earnings		$ 25,000,000
Deferred Credits and Other [Member] | R B S Sempra Commodities [Member]
Schedule of Equity Method Investments [Line Items]
Charge to equity earnings		75,000,000
Deferred Credits and Other [Member] | Sempra LNG [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Equity Method Investments [Line Items]
Guarantees, carrying value		4,000,000
Other current assets [Member] | Sempra LNG [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Equity Method Investments [Line Items]
Guarantees, carrying value		$ 7,000,000