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GENERAL INFORMATION AND OTHER FINANCIAL DATA - CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
AOCI, beginning balance [1] $ 17,138      
Cumulative-effect adjustment from change in accounting principle     $ 15 $ (1)
AOCI, ending balance 17,346      
Foreign currency translation adjustments [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
AOCI, beginning balance (564) $ (420)    
Cumulative-effect adjustment from change in accounting principle     0 0
OCI before reclassifications 32 24    
Amounts reclassified from AOCI 0 0    
Net OCI 32 24    
AOCI, ending balance (532) (396)    
Financial instruments [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
AOCI, beginning balance (82) (122)    
Cumulative-effect adjustment from change in accounting principle     (25) (3)
OCI before reclassifications (45) 66    
Amounts reclassified from AOCI (1) (8)    
Net OCI (46) 58    
AOCI, ending balance (153) (67)    
Pension and other postretirement benefits [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
AOCI, beginning balance (118) (84)    
Cumulative-effect adjustment from change in accounting principle     (17) 0
OCI before reclassifications 1 0    
Amounts reclassified from AOCI 2 2    
Net OCI 3 2    
AOCI, ending balance (132) (82)    
Total accumulated other comprehensive income (loss) [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
AOCI, beginning balance (764) (626)    
Cumulative-effect adjustment from change in accounting principle     (42) $ (3)
OCI before reclassifications (12) 90    
Amounts reclassified from AOCI 1 (6)    
Net OCI (11) 84    
AOCI, ending balance (817) (545)    
San Diego Gas and Electric Company [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
AOCI, beginning balance [1] 6,015      
Cumulative-effect adjustment from change in accounting principle     0  
AOCI, ending balance 6,191      
San Diego Gas and Electric Company [Member] | Pension and other postretirement benefits [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
AOCI, beginning balance (10) (8)    
Cumulative-effect adjustment from change in accounting principle     (2)  
AOCI, ending balance (12) (8)    
San Diego Gas and Electric Company [Member] | Total accumulated other comprehensive income (loss) [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
AOCI, beginning balance (10) (8)    
Cumulative-effect adjustment from change in accounting principle     (2)  
AOCI, ending balance (12) (8)    
Southern California Gas Company [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
AOCI, beginning balance [1] 4,258      
Cumulative-effect adjustment from change in accounting principle     (2)  
AOCI, ending balance 4,520      
Southern California Gas Company [Member] | Financial instruments [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
AOCI, beginning balance (12) (13)    
Cumulative-effect adjustment from change in accounting principle     (2)  
AOCI, ending balance (14) (13)    
Southern California Gas Company [Member] | Pension and other postretirement benefits [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
AOCI, beginning balance (8) (8)    
Cumulative-effect adjustment from change in accounting principle     (2)  
AOCI, ending balance (10) (8)    
Southern California Gas Company [Member] | Total accumulated other comprehensive income (loss) [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
AOCI, beginning balance (20) (21)    
Cumulative-effect adjustment from change in accounting principle     $ (4)  
AOCI, ending balance $ (24) $ (21)    
[1] Derived from audited financial statements.