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COMMITMENTS AND CONTINGENCIES - LEGAL PROCEEDINGS (Details)
$ in Millions
1 Months Ended 3 Months Ended 4 Months Ended
Apr. 30, 2021
plaintiff
lawsuit
Nov. 30, 2019
customer
Jan. 31, 2017
lawsuit
Mar. 31, 2021
USD ($)
lawsuit
Jan. 31, 2019
plaintiff
Dec. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Loss Contingencies [Line Items]              
Liability for legal proceedings       $ 602      
Number of alleged violations | customer   330          
Reserve for Aliso Canyon costs       285   $ 301 [1]  
Guaymas-El Oror Segment, Sonora Pipeline [Member]              
Loss Contingencies [Line Items]              
Net book value of pipeline       442      
Consolidated Class Action Complaints [Member]              
Loss Contingencies [Line Items]              
Number of lawsuits filed | lawsuit     2        
Property Class Action [Member]              
Loss Contingencies [Line Items]              
Number of lawsuits filed | lawsuit     1        
Southern California Gas Company [Member]              
Loss Contingencies [Line Items]              
Liability for legal proceedings       458      
Insurance settlements receivable       1,279      
Reserve for Aliso Canyon costs       285   $ 301 [2]  
Southern California Gas Company [Member] | Aliso Canyon Natural Gas Storage Facility Gas Leak [Member]              
Loss Contingencies [Line Items]              
Liability for legal proceedings       432      
Net book value of Aliso Canyon facility       840      
Estimate of costs       1,627      
Reserve for Aliso Canyon costs       437      
Loss contingency accrual             $ 277
Receivable related to natural gas leak       414      
Insurance proceeds       $ 865      
Southern California Gas Company [Member] | Shareholder Derivative Complaint [Member]              
Loss Contingencies [Line Items]              
Number of lawsuits | lawsuit       4      
Southern California Gas Company [Member] | Complaints Filed by Firefighters [Member] | Aliso Canyon Natural Gas Storage Facility Gas Leak [Member]              
Loss Contingencies [Line Items]              
Number of plaintiffs | plaintiff         51    
Subsequent Event [Member] | Southern California Gas Company [Member] | Aliso Canyon Natural Gas Storage Facility Gas Leak [Member]              
Loss Contingencies [Line Items]              
Number of lawsuits | lawsuit 395            
Number of plaintiffs | plaintiff 36,000            
Insurance Receivable [Member] | Southern California Gas Company [Member] | Aliso Canyon Natural Gas Storage Facility Gas Leak [Member]              
Loss Contingencies [Line Items]              
Loss contingency accrual             177
Aliso Canyon Litigation and Regulatory Matters | Southern California Gas Company [Member] | Aliso Canyon Natural Gas Storage Facility Gas Leak [Member]              
Loss Contingencies [Line Items]              
Loss contingency accrual             100
Loss contingency accrual, after tax             $ 72
[1] Derived from audited financial statements.
[2] Derived from audited financial statements.