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GENERAL INFORMATION AND OTHER FINANCIAL DATA - CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
AOCI, beginning balance [1]     $ (626)      
Cumulative-effect adjustment from change in accounting principle(2)         $ (1)  
Amounts reclassified from AOCI $ 10 $ 1 4 $ 9    
AOCI, ending balance (601)   (601)      
Foreign currency translation adjustments [Member]            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
AOCI, beginning balance (396) (481) (420) (527)    
Cumulative-effect adjustment from change in accounting principle(2)           $ 0
OCI before reclassifications (86) 3 (62) 49    
Amounts reclassified from AOCI 0 0 0 0    
Net OCI (86) 3 (62) 49    
AOCI, ending balance (482) (478) (482) (478)    
Financial instruments [Member]            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
AOCI, beginning balance (67) (121) (122) (125)    
Cumulative-effect adjustment from change in accounting principle(2) (3)   (3)      
OCI before reclassifications 19 (26) 85 (28)    
Amounts reclassified from AOCI 8 0 0 6    
Net OCI 27 (26) 85 (22)    
AOCI, ending balance (40) (147) (40) (147)    
Pension and other postretirement benefits [Member]            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
AOCI, beginning balance (82) (94) (84) (96)    
Cumulative-effect adjustment from change in accounting principle(2)           $ 0
OCI before reclassifications 1 0 1 0    
Amounts reclassified from AOCI 2 1 4 3    
Net OCI 3 1 5 3    
AOCI, ending balance (79) (93) (79) (93)    
Total accumulated other comprehensive income (loss) [Member]            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
AOCI, beginning balance (545) (696) (626) (748)    
Cumulative-effect adjustment from change in accounting principle(2) (3)   (3)      
OCI before reclassifications (66) (23) 24 21    
Amounts reclassified from AOCI 10 1 4 9    
Net OCI (56) (22) 28 30    
AOCI, ending balance (601) (718) (601) (718)    
San Diego Gas and Electric Company [Member]            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
AOCI, beginning balance [1]     (8)      
Amounts reclassified from AOCI 0 0        
AOCI, ending balance (8)   (8)      
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 (8) (8) (8) (8)    
AOCI, ending balance (8) (8) (8) (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 (8) (8) (8) (8)    
AOCI, ending balance (8) (8) (8) (8)    
Southern California Gas Company [Member]            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
AOCI, beginning balance [1]     (21)      
Amounts reclassified from AOCI 1 1 1 1    
AOCI, ending balance (20)   (20)      
Southern California Gas Company [Member] | Financial instruments [Member]            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
AOCI, beginning balance (13) (13) (13) (13)    
Amounts reclassified from AOCI 0 0 0 0    
Net OCI 0 0 0 0    
AOCI, ending balance (13) (13) (13) (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) (9) (8) (9)    
Amounts reclassified from AOCI 1 1 1 1    
Net OCI 1 1 1 1    
AOCI, ending balance (7) (8) (7) (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 (21) (22) (21) (22)    
Amounts reclassified from AOCI 1 1 1 1    
Net OCI 1 1 1 1    
AOCI, ending balance $ (20) $ (21) $ (20) $ (21)    
[1] Derived from audited financial statements.