INVESTMENTS IN UNCONSOLIDATED ENTITIES - NARRATIVE (Details)			1 Months Ended				12 Months Ended
	May 16, 2019 USD ($)	Mar. 09, 2018	Feb. 28, 2021 USD ($)	Jul. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2020 USD ($) MT Bcf	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Feb. 29, 2020	May 31, 2019	Jun. 30, 2015 USD ($)	Nov. 30, 2014 USD ($)	Oct. 31, 2014 USD ($)
Schedule of Equity Method Investments [Line Items]
Undistributed earnings from equity method investments					$ 634,000,000		$ 1,100,000,000	$ 634,000,000
Undistributed earnings, equity method investments, over 50 percent owned							792,000,000
Interest costs capitalized							202,000,000	183,000,000	$ 193,000,000
Debt instrument converted							22,000,000	0	0
Return of investment							761,000,000	9,000,000	10,000,000
Equity earnings							1,015,000,000	580,000,000	175,000,000
Oncor Electric Delivery Holdings Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Cash contributed to fund the acquisition					1,067,000,000			1,067,000,000
R B S Sempra Commodities [Member]
Schedule of Equity Method Investments [Line Items]
Other than temporary impairment						$ 65,000,000
Equity earnings							(100,000,000)
R B S Sempra Commodities [Member] | Current liabilities: Other [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings							25,000,000
R B S Sempra Commodities [Member] | Deferred Credits and Other [Member]
Schedule of Equity Method Investments [Line Items]
Equity earnings							$ 75,000,000
Cameron LNG [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in equity method investee							50.20%
Threshold for canceling of hedge, Percent of unamortized principal							50.00%
Indirect economic and beneficial and ownership interest prior to financial completion							37.65%
Indirect economic and beneficial and ownership interest after financial completion							10.00%
Cameron LNG [Member] | Other Long Term Debt, Due July 2030 [Member]
Schedule of Equity Method Investments [Line Items]
Maximum exposure percentage							50.20%
Debt instrument, maximum borrowing amount							$ 4,000,000,000.0							$ 82,000,000
Maximum exposure, remaining percentage							49.80%
Current guarantor obligations					$ 3,000,000		$ 1,000,000	$ 3,000,000
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%	100.00%
Sempra Mexico [Member] | IMG [Member]
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments									80,000,000
Ownership percentage in equity method investee							40.00%
Transportation service contract term							35 years
Sempra Renewables [Member]
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments									5,000,000
Other than temporary impairment									200,000,000
Sempra LNG [Member]
Schedule of Equity Method Investments [Line Items]
Debt instrument, maximum borrowing amount							$ 4,000,000,000.0
Sempra LNG [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Equity Method Investments [Line Items]
Debt instrument, maximum borrowing amount							979,000,000
Current guarantor obligations							3,000,000
Sempra LNG [Member] | Deferred Credits and Other [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Equity Method Investments [Line Items]
Current guarantor obligations							4,000,000
Sempra LNG [Member] | Current assets: Other [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Equity Method Investments [Line Items]
Current guarantor obligations							7,000,000
Sempra LNG [Member] | Cameron LNG [Member]
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments							$ 54,000,000	$ 77,000,000	228,000,000
Project capacity | MT							13.9
Proved undeveloped reserve | MT							12
Proved undeveloped reserve per day | Bcf							1.7
Interest costs capitalized								$ 33,000,000	47,000,000
Debt amount							$ 7,400,000,000
Debt instrument converted					$ 3,000,000,000.0
Fixed percentage interest rate					3.39%			3.39%
Term of contract								15 years 4 months 24 days
Percentage of debt hedged by interest rate derivatives							50.00%
Notional amount of derivatives												$ 1,500,000,000	$ 3,700,000,000
Derivative amount terminated					$ 790,000,000
Effective fixed rate (as a percent)					3.26%
Weighted-average all-in cost of loans outstanding (as a percent)							3.72%
Sempra LNG [Member] | Cameron LNG [Member] | Corporate Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Proceeds from related parties				$ 1,500,000,000
Debt covenant, liability cap (as a percent)							130.00%
Debt covenant, liability cap amount							$ 979,000,000
Sempra LNG [Member] | Cameron LNG [Member] | Corporate Joint Venture [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Equity Method Investments [Line Items]
Proceeds from related parties				$ 753,000,000
Return of investment							$ 753,000,000
Sempra LNG [Member] | LIBOR [Member] | Cameron LNG [Member]
Schedule of Equity Method Investments [Line Items]
Fixed percentage interest rate												3.32%	3.19%
Weighted average rate prior to project completion							0.98%
Weighted average rate after project completion							1.22%
Sharyland Holdings, LP [Member]
Schedule of Equity Method Investments [Line Items]
Acquired percentage interest	50.00%
Payments to acquire equity method investments	$ 95,000,000							$ 3,000,000
Post-closing adjustments	7,000,000
Total purchase price paid	$ 95,000,000
Sharyland Holdings, LP [Member] | Sempra Texas Intermediate Holding Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Acquired percentage interest											50.00%
ESJ [Member] | Sempra Mexico [Member] | IEnova [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in consolidated entity							100.00%
ESJ [Member] | Sempra Mexico [Member] | IEnova [Member] | Subsequent Event [Member]
Schedule of Equity Method Investments [Line Items]
Acquired percentage interest			50.00%
Total purchase price paid			$ 83,000,000
Oncor Electric Delivery Holdings Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments							$ 632,000,000	$ 1,587,000,000	$ 230,000,000
Oncor Electric Delivery Holdings Company LLC [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%					100.00%
Oncor Electric Delivery Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Acquired percentage interest		80.25%
Ownership percentage held by noncontrolling owners										80.45%
Oncor Electric Delivery Company LLC [Member] | Sempra Texas Holdings Corp [Member]
Schedule of Equity Method Investments [Line Items]
Acquired percentage interest		80.03%
Oncor Electric Delivery Company LLC [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%
Cameron LNG [Member] | Sempra LNG [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in consolidated entity							50.20%
ESJ [Member] | ESJ [Member] | Sempra Mexico [Member] | IEnova [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage held by noncontrolling owners							50.00%