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Cover - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 21, 2020
Jun. 30, 2019
Document And Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 1-14201    
Entity Registrant Name SEMPRA ENERGY    
Entity Incorporation, State or Country Code CA    
Entity Tax Identification Number 33-0732627    
Entity Address, Address Line One 488 8th Avenue    
Entity Address, City or Town San Diego,    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 92101    
City Area Code (619)    
Local Phone Number 696-2000    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 37,700,000,000
Entity Common Stock, Shares Outstanding   292,276,007  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE:
 
Portions of the Sempra Energy Proxy Statement to be filed for its May 2020 annual meeting of shareholders are incorporated by reference into Part III of this annual report on Form 10-K.
 
Portions of the Southern California Gas Company Information Statement to be filed for its May 2020 annual meeting of shareholders are incorporated by reference into Part III of this annual report on Form 10-K.
 
 
 
 
 
 

    
Entity Central Index Key 0001032208    
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31    
San Diego Gas and Electric Company [Member]      
Document And Entity Information [Line Items]      
Entity File Number 1-03779    
Entity Registrant Name SAN DIEGO GAS & ELECTRIC COMPANY    
Entity Incorporation, State or Country Code CA    
Entity Tax Identification Number 95-1184800    
Entity Address, Address Line One 8326 Century Park Court    
Entity Address, City or Town San Diego,    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 92123    
City Area Code (619)    
Local Phone Number 696-2000    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     0
Entity Central Index Key 0000086521    
Southern California Gas Company [Member]      
Document And Entity Information [Line Items]      
Entity File Number 1-01402    
Entity Registrant Name SOUTHERN CALIFORNIA GAS COMPANY    
Entity Incorporation, State or Country Code CA    
Entity Tax Identification Number 95-1240705    
Entity Address, Address Line One 555 West Fifth Street    
Entity Address, City or Town Los Angeles,    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 90013    
City Area Code (213)    
Local Phone Number 244-1200    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 0
Entity Central Index Key 0000092108    
Common Stock [Member]      
Document And Entity Information [Line Items]      
Title of 12(b) Security Common Stock, without par value    
Trading Symbol SRE    
Security Exchange Name NYSE    
Convertible Preferred Stock Series A [Member]      
Document And Entity Information [Line Items]      
Title of 12(b) Security 6% Mandatory Convertible Preferred Stock, Series A, $100 liquidation preference    
Trading Symbol SREPRA    
Security Exchange Name NYSE    
Convertible Preferred Stock Series B [Member]      
Document And Entity Information [Line Items]      
Title of 12(b) Security 6.75% Mandatory Convertible Preferred Stock, Series B, $100 liquidation preference    
Trading Symbol SREPRB    
Security Exchange Name NYSE    
Sempra Energy 5.75% Junior Subordinated Notes Due 2079 [Member]      
Document And Entity Information [Line Items]      
Title of 12(b) Security 5.75% Junior Subordinated Notes Due 2079, $25 par value    
Trading Symbol SREA    
Security Exchange Name NYSE    
Preferred Stock [Member] | Southern California Gas Company [Member]      
Document And Entity Information [Line Items]      
Title of 12(g) Security 6% Preferred Stock, $25 par value    
Preferred Stock Series A [Member] | Southern California Gas Company [Member]      
Document And Entity Information [Line Items]      
Title of 12(g) Security 6% Preferred Stock, Series A, $25 par value