DEBT AND CREDIT FACILITIES - LINES OF CREDIT (Details)	1 Months Ended	6 Months Ended
	Mar. 31, 2020 USD ($)	Jun. 30, 2020 USD ($) lender
Line of Credit Facility [Line Items]
Standby letters of credit outstanding		$ 609,000,000
Sempra Energy [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity		1,250,000,000
Capacity for issuance of letters of credit		200,000,000
Option to request		500,000,000
Sempra Global [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity		3,185,000,000
San Diego Gas and Electric Company [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 1,500,000,000
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
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%
Sempra U.S. Businesses [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 6,685,000,000
Maximum ratio of indebtedness to total capitalization		65.00%
Foreign Line of Credit [Member] | Sempra Mexico [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 1,780,000,000
Amount outstanding		(1,544,000,000)
Available unused credit		236,000,000
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		(1,264,000,000)
Available unused credit		$ 236,000,000
Term of debt instrument		5 years
Number of lenders | lender		10
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
Term of debt instrument		2 years
Foreign Uncommitted Revolving Credit Facility Due April 2022 [Member] | Foreign Line of Credit [Member] | Sempra Mexico [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 100,000,000
Available unused credit		$ 100,000,000
Term of debt instrument		3 years
Term Loan [Member] | Sempra Energy [Member]
Line of Credit Facility [Line Items]
Net proceeds of debt	$ 1,599,000,000
Debt issuance costs		$ 1,000,000
Spread on variable rate (as a percent)		0.98%
Term Loan [Member] | San Diego Gas and Electric Company [Member]
Line of Credit Facility [Line Items]
Net proceeds of debt	$ 200,000,000
Spread on variable rate (as a percent)		0.99%