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COMMITMENTS AND CONTINGENCIES - LEGAL PROCEEDINGS (Details)
$ in Millions
1 Months Ended 3 Months Ended 7 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
plaintiff
lawsuit
Mar. 31, 2023
USD ($)
lawsuit
Mar. 31, 2022
USD ($)
Apr. 28, 2023
plaintiff
complaint
Dec. 31, 2022
USD ($)
Feb. 21, 2023
plaintiff
Jan. 31, 2021
lawsuit
Loss Contingencies [Line Items]              
Liability for legal proceedings   $ 280          
Aliso Canyon litigation and regulatory matters   0 $ 92        
Aliso Canyon Natural Gas Storage Facility Gas Leak              
Loss Contingencies [Line Items]              
Liability for legal proceedings   129          
Southern California Gas Company              
Loss Contingencies [Line Items]              
Liability for legal proceedings   204          
Aliso Canyon litigation and regulatory matters   0 92        
Southern California Gas Company | Aliso Canyon Natural Gas Storage Facility Gas Leak              
Loss Contingencies [Line Items]              
Liability for legal proceedings   129          
Number of lawsuits | lawsuit 390            
Number of plaintiffs | plaintiff 36,000            
Reserve for Aliso Canyon costs   129          
Net book value of Aliso Canyon facility   $ 965          
Aliso Canyon litigation and regulatory matters, net of tax     $ 66        
Southern California Gas Company | Shareholder Derivative Complaint              
Loss Contingencies [Line Items]              
Number of lawsuits | lawsuit   4         3
Southern California Gas Company | Individual Plaintiff Litigation | Aliso Canyon Natural Gas Storage Facility Gas Leak              
Loss Contingencies [Line Items]              
Estimate of costs $ 1,800            
Percentage of plaintiffs agreeing to participate and submit releases         99.00%    
Number of plaintiffs not contacted | plaintiff           265  
Payment of Liquidating Companies' costs         $ 1,790    
Southern California Gas Company | The Developer Plaintiffs | Aliso Canyon Natural Gas Storage Facility Gas Leak | Subsequent Event              
Loss Contingencies [Line Items]              
Number of plaintiffs | plaintiff       310      
Loss Contingency, Number Of Complaints On Behalf Of Plaintiffs | complaint       25      
Deferred Credits and Other | Southern California Gas Company | Aliso Canyon Natural Gas Storage Facility Gas Leak              
Loss Contingencies [Line Items]              
Reserve for Aliso Canyon costs   $ 3