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COMMITMENTS AND CONTINGENCIES - LEGAL PROCEEDINGS (Details)
$ in Millions
1 Months Ended 4 Months Ended 6 Months Ended
Aug. 02, 2021
lawsuit
plaintiff
Nov. 30, 2019
customer
Jan. 31, 2017
lawsuit
Jan. 31, 2019
plaintiff
Jun. 30, 2021
USD ($)
lawsuit
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Loss Contingencies [Line Items]              
Liability for legal proceedings         $ 523    
Number of alleged violations | customer   324          
Reserve for Aliso Canyon costs         269 $ 301 [1]  
Guaymas-El Oror Segment, Sonora Pipeline [Member]              
Loss Contingencies [Line Items]              
Net book value of pipeline         439    
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         445    
Insurance settlements receivable         1,279    
Reserve for Aliso Canyon costs         269 $ 301 [2]  
Southern California Gas Company [Member] | Aliso Canyon Natural Gas Storage Facility Gas Leak [Member]              
Loss Contingencies [Line Items]              
Liability for legal proceedings         419    
Net book value of Aliso Canyon facility         858    
Estimate of costs         1,627    
Reserve for Aliso Canyon costs         422    
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      
Sempra Mexico [Member] | Regulatory Actions by the Mexican Government              
Loss Contingencies [Line Items]              
Other intangible assets, net         $ 15    
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 396            
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.