DEBT AND CREDIT FACILITIES - SUMMARY OF LINES OF CREDIT (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Commercial paper [Member]
Line of Credit Facility [Line Items]
Line of credit outstanding	$ (2,334,000,000)
Sempra Energy [Member]
Line of Credit Facility [Line Items]
Total facility	1,250,000,000
Available unused credit	1,250,000,000
Committed lines of credit, capacity for issuance of letters of credit	200,000,000
Line of credit, increase limit	500,000,000
Sempra Energy [Member] | Commercial paper [Member]
Line of Credit Facility [Line Items]
Line of credit outstanding	0
Sempra Global [Member]
Line of Credit Facility [Line Items]
Total facility	3,185,000,000
Available unused credit	1,561,000,000
Sempra Global [Member] | Commercial paper [Member]
Line of Credit Facility [Line Items]
Line of credit outstanding	(1,624,000,000)
Unamortized discount on long-term debt	3,000,000
San Diego Gas and Electric Company [Member]
Line of Credit Facility [Line Items]
Total facility	1,500,000,000
Available unused credit	1,420,000,000
Unamortized discount on long-term debt	12,000,000	$ 12,000,000
San Diego Gas and Electric Company [Member] | Commercial paper [Member]
Line of Credit Facility [Line Items]
Line of credit outstanding	(80,000,000)
Southern California Gas Company [Member]
Line of Credit Facility [Line Items]
Total facility	750,000,000
Available unused credit	120,000,000
Committed lines of credit, capacity for issuance of letters of credit	100,000,000
Line of credit, increase limit	250,000,000
Unamortized discount on long-term debt	7,000,000	$ 6,000,000
Southern California Gas Company [Member] | Commercial paper [Member]
Line of Credit Facility [Line Items]
Line of credit outstanding	(630,000,000)
Sempra Mexico [Member] | Foreign Line of Credit [Member]
Line of Credit Facility [Line Items]
Total facility	1,880,000,000
Line of credit outstanding	(1,174,000,000)
Available unused credit	706,000,000
Foreign Committed Lines of Credit, Due February 2024 [Member] | Sempra Mexico [Member] | Foreign Line of Credit [Member]
Line of Credit Facility [Line Items]
Total facility	1,500,000,000
Line of credit outstanding	(894,000,000)
Available unused credit	606,000,000
Foreign Committed Lines of Credit, Due April 2022 [Member] | Sempra Mexico [Member] | Foreign Line of Credit [Member]
Line of Credit Facility [Line Items]
Total facility	100,000,000
Line of credit outstanding	0
Available unused credit	100,000,000
Foreign Committed Lines of Credit, Due September 2021 [Member] | Sempra Mexico [Member] | Foreign Line of Credit [Member]
Line of Credit Facility [Line Items]
Total facility	280,000,000
Line of credit outstanding	(280,000,000)
Available unused credit	$ 0