INVESTMENTS IN UNCONSOLIDATED ENTITIES - NARRATIVE (Details)	1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 31, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Jul. 31, 2021 bank	Mar. 31, 2021 USD ($)	Mar. 19, 2021	Mar. 18, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Distributions from investments				$ 365,000,000	$ 761,000,000
Charge to equity earnings		$ (391,000,000)	$ (326,000,000)	(1,022,000,000)	(822,000,000)
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
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		151,000,000	209,000,000	151,000,000	209,000,000
Sempra LNG [Member]
Schedule of Equity Method Investments [Line Items]
Maximum exposure under guarantor obligations							$ 4,000,000,000
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		5,000,000		5,000,000
Corporate Joint Venture [Member] | Sempra LNG [Member] | Cameron LNG [Member]
Schedule of Equity Method Investments [Line Items]
Contribution			$ 54,000,000		54,000,000
Proceeds from dividends received				$ 496,000,000	209,000,000
Distributions from investments					803,000,000
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]
Distributions from investments	753,000,000
Proceeds from related party debt	$ 753,000,000
Number of banks | bank						8
Oncor Holdings [Member] | Sempra Texas Utilities [Member]
Schedule of Equity Method Investments [Line Items]
Proceeds from dividends received				239,000,000	220,000,000
Distributions from investments				$ 361,000,000
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	$ 8,000,000
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%
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		$ 2,000,000		2,000,000
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]
Guarantees, carrying value		22,000,000		22,000,000
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		$ 22,000,000		$ 22,000,000