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SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI, beginning balance $ 12,670      
Amounts reclassified from AOCI(2) 21 $ 19 $ 18  
Cumulative-effect adjustment from change in accounting priniciple   (1)   $ 107
AOCI, ending balance 17,138 12,670    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Sale of noncontrolling interests, net of offering costs 90 196 1,701  
San Diego Gas and Electric Company [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI, beginning balance 5,598      
Amounts reclassified from AOCI(2) 4 1 1  
Cumulative-effect adjustment from change in accounting priniciple       23
AOCI, ending balance 6,015 5,598    
Southern California Gas Company [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI, beginning balance 3,907      
Amounts reclassified from AOCI(2) 2 1 1  
Cumulative-effect adjustment from change in accounting priniciple       $ 15
AOCI, ending balance 4,258 3,907    
Foreign currency translation adjustments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI, beginning balance (420) (527) (582)  
OCI before reclassifications (144) 107 42  
Amounts reclassified from AOCI(2) 0 0 13  
Total other comprehensive income (loss) (144) 107 55  
Cumulative-effect adjustment from change in accounting priniciple   0    
AOCI, ending balance (564) (420) (527)  
Financial instruments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI, beginning balance (122) (125) (137)  
OCI before reclassifications 40 (4) (7)  
Amounts reclassified from AOCI(2) 3 7 19  
Total other comprehensive income (loss) 43 3 12  
Cumulative-effect adjustment from change in accounting priniciple   (3)    
AOCI, ending balance (82) (122) (125)  
Financial instruments [Member] | Southern California Gas Company [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI, beginning balance (13) (13) (14)  
OCI before reclassifications 0   0  
Amounts reclassified from AOCI(2) 1 0 1  
Total other comprehensive income (loss) 1 0 1  
AOCI, ending balance (12) (13) (13)  
Pension and other postretirement benefits [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI, beginning balance (84) (96) (87)  
OCI before reclassifications (52) 0 (15)  
Amounts reclassified from AOCI(2) 18 12 6  
Total other comprehensive income (loss) (34) 12 (9)  
Cumulative-effect adjustment from change in accounting priniciple   0    
AOCI, ending balance (118) (84) (96)  
Pension and other postretirement benefits [Member] | San Diego Gas and Electric Company [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI, beginning balance (8) (8) (8)  
OCI before reclassifications (6) (1) (1)  
Amounts reclassified from AOCI(2) 4 1 1  
Total other comprehensive income (loss) (2) 0 0  
AOCI, ending balance (10) (8) (8)  
Pension and other postretirement benefits [Member] | Southern California Gas Company [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI, beginning balance (8) (9) (5)  
OCI before reclassifications (1)   (4)  
Amounts reclassified from AOCI(2) 1 1 0  
Total other comprehensive income (loss) 0 1 (4)  
AOCI, ending balance (8) (8) (9)  
Accumulated other comprehensive income (loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI, beginning balance (626) (748) (806)  
OCI before reclassifications (156) 103 20  
Amounts reclassified from AOCI(2) 21 19 38  
Total other comprehensive income (loss) (135) 122 58  
Cumulative-effect adjustment from change in accounting priniciple   (3)    
AOCI, ending balance (764) (626) (748)  
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Sale of noncontrolling interests, net of offering costs     20  
Accumulated other comprehensive income (loss) [Member] | San Diego Gas and Electric Company [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI, beginning balance (8) (8) (8)  
OCI before reclassifications (6) (1) (1)  
Amounts reclassified from AOCI(2) 4 1 1  
Total other comprehensive income (loss) (2) 0 0  
AOCI, ending balance (10) (8) (8)  
Accumulated other comprehensive income (loss) [Member] | Southern California Gas Company [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI, beginning balance (21) (22) (19)  
OCI before reclassifications (1)   (4)  
Amounts reclassified from AOCI(2) 2 1 1  
Total other comprehensive income (loss) 1 1 (3)  
AOCI, ending balance $ (20) $ (21) $ (22)