DEBT AND CREDIT FACILITIES - LINES OF CREDIT (Details) - USD ($)	1 Months Ended		6 Months Ended
	Jul. 31, 2021	May 31, 2021	Jun. 30, 2021
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 6,685,000,000
Capacity for issuance of letters of credit			$ 200,000,000
Maximum ratio of indebtedness to total capitalization			65.00%
Standby letters of credit outstanding			$ 680,000,000
Sempra U.S. Businesses [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity			6,700,000,000
Available unused credit			4,988,000,000
Sempra Energy [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 3,200,000,000	4,435,000,000
Term of debt instrument		5 years
Available unused credit			3,318,000,000
Option to request			500,000,000
San Diego Gas and Electric Company [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity			1,500,000,000
Available unused credit			1,063,000,000
Capacity for issuance of letters of credit			100,000,000
Option to request			$ 250,000,000
Maximum ratio of indebtedness to total capitalization			65.00%
Southern California Gas Company [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 750,000,000
Available unused credit			607,000,000
Capacity for issuance of letters of credit			100,000,000
Option to request			$ 250,000,000
Maximum ratio of indebtedness to total capitalization			65.00%
Commercial Paper
Line of Credit Facility [Line Items]
Amount outstanding			$ (1,697,000,000)
Commercial Paper | Sempra Energy [Member]
Line of Credit Facility [Line Items]
Amount outstanding			(1,117,000,000)
Commercial Paper | San Diego Gas and Electric Company [Member]
Line of Credit Facility [Line Items]
Amount outstanding			(437,000,000)
Commercial Paper | Southern California Gas Company [Member]
Line of Credit Facility [Line Items]
Amount outstanding			(143,000,000)
Foreign Line of Credit [Member] | Sempra Mexico [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity			1,780,000,000
Amount outstanding			(469,000,000)
Available unused credit			1,311,000,000
Secured Debt | San Diego Gas and Electric Company [Member] | Term Loan Due 2022
Line of Credit Facility [Line Items]
Debt amount			375,000,000
Secured Debt | San Diego Gas and Electric Company [Member] | Term Loan Due 2022 | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Proceeds from debt issuance	$ 200,000,000
Spread on variable rate (as a percent)	0.625%
Foreign Committed Lines of Credit, Due February 2024 [Member] | Foreign Line of Credit [Member] | Sempra Mexico [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity			1,500,000,000
Amount outstanding			(189,000,000)
Available unused credit			1,311,000,000
Foreign Committed Lines of Credit, Due September 2021 [Member] | Foreign Line of Credit [Member] | Sempra Mexico [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity			280,000,000
Amount outstanding			(280,000,000)
Available unused credit			0
Uncommitted Revolving Credit Facility with Scotiabank Inverlat S.A. [Member] | Foreign Line of Credit [Member] | Sempra Mexico [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 20,000,000
Term of debt instrument			3 years
Uncommitted Revolving Credit Facility with Bank of Nova Scotia [Member] | Foreign Line of Credit [Member] | Sempra Mexico [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 100,000,000
Term of debt instrument			3 years
Foreign Uncommitted Revolving Credit Facility Due April 2022 [Member] | Foreign Line of Credit [Member] | Sempra Mexico [Member]
Line of Credit Facility [Line Items]
Available unused credit			$ 20,000,000