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SEMPRA - EQUITY AND EARNINGS PER COMMON SHARE - COMMON STOCK NARRATIVE (Details)
$ / shares in Units, $ in Millions
1 Months Ended 6 Months Ended
Aug. 02, 2023
shares
Nov. 30, 2023
$ / shares
shares
Jun. 30, 2024
USD ($)
shares
Jun. 30, 2023
USD ($)
shares
Aug. 06, 2024
shares
Dec. 31, 2023
shares
Equity, Class of Treasury Stock [Line Items]            
Stock split, conversion ratio 2          
Stock dividend (in percent) 100.00%          
Common stock, shares authorized (in shares) 1,125,000,000   1,125,000,000     1,125,000,000
Common stock            
Equity, Class of Treasury Stock [Line Items]            
Share repurchase program, number of shares repurchased (in shares)     555,888 395,540    
Common stock repurchased | $     $ 40 $ 31    
Subsequent Event            
Equity, Class of Treasury Stock [Line Items]            
Sale of stock, shares available for future settlement         17,142,858  
Public Stock Offering            
Equity, Class of Treasury Stock [Line Items]            
Sale of stock, number of shares issued in transaction   19,242,010        
Common stock, par or stated value per share (usd per share) | $ / shares   $ 0        
Sale of stock, price per share (usd per share) | $ / shares   70.00        
Sale of stock, price per share, after underwriting discounts (usd per share) | $ / shares   $ 68.845        
Public Stock Offering Pursuant to Forward Sale Agreement            
Equity, Class of Treasury Stock [Line Items]            
Sale of stock, number of shares issued in transaction   17,142,858