INVESTMENTS IN UNCONSOLIDATED ENTITIES - NARRATIVE (Details) - USD ($)	1 Months Ended	3 Months Ended			6 Months Ended
	Jul. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021	Mar. 19, 2021	Mar. 18, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Charge to equity earnings		$ (313,000,000)	$ (233,000,000)		$ (631,000,000)	$ (496,000,000)
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			4,000,000,000.0
R B S Sempra Commodities [Member]
Schedule of Equity Method Investments [Line Items]
Charge to equity earnings		50,000,000		$ 100,000,000
Sempra Texas Utilities [Member] | Oncor Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Contribution		100,000,000	$ 139,000,000		100,000,000	139,000,000
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			979,000,000
Guarantees, carrying value		4,000,000			4,000,000
Corporate Joint Venture [Member] | Sempra LNG [Member] | Cameron LNG [Member]
Schedule of Equity Method Investments [Line Items]
Proceeds from dividends received					$ 378,000,000	74,000,000
Proceeds from related party debt	$ 1,500,000,000
Liability cap (as a percent)					130.00%
Liability cap, amount		$ 979,000,000			$ 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					$ 162,000,000	146,000,000
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%			80.25%
Cameron LNG [Member] | Sempra LNG [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in consolidated entity					50.20%
ESJ [Member] | Sempra Mexico [Member]
Schedule of Equity Method Investments [Line Items]
Proceeds from dividends received					$ 4,000,000	$ 4,000,000
ESJ [Member] | IEnova [Member] | Sempra Mexico [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage									50.00%	50.00%
ESJ [Member] | ESJ [Member] | IEnova [Member] | Sempra Mexico [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage										50.00%
Other Current Liabilities [Member] | R B S Sempra Commodities [Member]
Schedule of Equity Method Investments [Line Items]
Charge to equity earnings					50,000,000
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		$ 3,000,000			3,000,000
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			7,000,000
Promissory Note for SDSRA Distribution [Member] | Corporate Joint Venture [Member] | Sempra LNG [Member] | Cameron LNG [Member]
Schedule of Equity Method Investments [Line Items]
Proceeds from dividends received					165,000,000
Promissory Note for SDSRA Distribution [Member] | Other Current Liabilities [Member] | Corporate Joint Venture [Member] | Sempra LNG [Member] | Cameron LNG [Member]
Schedule of Equity Method Investments [Line Items]
Senior note, liability		1,000,000			1,000,000
Promissory Note for SDSRA Distribution [Member] | Deferred Credits and Other [Member] | Corporate Joint Venture [Member] | Sempra LNG [Member] | Cameron LNG [Member]
Schedule of Equity Method Investments [Line Items]
Senior note, liability		$ 21,000,000			$ 21,000,000