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SEMPRA ENERGY - SHAREHOLDERS' EQUITY AND EARNINGS PER SHARE SEMPRA ENERGY COMMON STOCK OFFERINGS (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Feb. 26, 2019
Jul. 13, 2018
Mar. 08, 2018
Jan. 09, 2018
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Issuances of common stock, net               $ 2,272 $ 47 $ 51
Common Stock [Member]                    
Shares issued (in shares)   11,212,500 8,556,630 26,869,158 7,651,671 8,556,630        
Public Offering [Member] | Common Stock [Member]                    
Shares issued (in shares)   9,750,000   23,364,486            
Price of shares issued (in dollars per share)   $ 113.75   $ 107.00            
Price of shares issued net of underwriting discount (in dollars per share)   $ 111.87   $ 105.07            
Over-Allotment Option [Member] | Common Stock [Member]                    
Shares issued (in shares)   1,462,500   3,504,672            
Issuances of common stock, net   $ 164   $ 367            
Underwriting discount       $ 8            
Settlement of Forward Sale Contracts [Member] | Common Stock [Member]                    
Issuances of common stock, net     $ 900   $ 800 $ 900        
Underwriting discount   $ 3     $ 14 $ 16        
Subsequent Event [Member] | Settlement of Forward Sale Contracts [Member] | Common Stock [Member]                    
Shares issuable under forward contracts 16,906,185                  
Minimum [Member] | Settlement of Forward Sale Contracts [Member] | Common Stock [Member]                    
Forward sales price (in usd per share)             $ 104.53      
Maximum [Member] | Settlement of Forward Sale Contracts [Member] | Common Stock [Member]                    
Forward sales price (in usd per share)             $ 105.18