XML 33 R1.htm IDEA: XBRL DOCUMENT v3.10.0.1
DOCUMENT AND ENTITY INFORMATION - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Feb. 21, 2019
Jun. 30, 2018
Document And Entity Information [Line Items]      
Entity Registrant Name SEMPRA ENERGY    
Entity Central Index Key 0001032208    
Document Type 10-K    
Document Period End Date Dec. 31, 2018    
Amendment Flag false    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Filer Category Large Accelerated Filer    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Common Stock, Shares Outstanding   274,039,296  
Entity Public Float     $ 31,500
Trading Symbol SRE    
Entity Emerging Growth Company false    
Entity Small Business false    
Entity Shell Company false    
San Diego Gas and Electric Company [Member]      
Document And Entity Information [Line Items]      
Entity Public Float     0
Southern California Gas Company [Member]      
Document And Entity Information [Line Items]      
Entity Public Float     $ 0