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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Beginning balance [1]     $ 17,138      
Cumulative-effect adjustment from change in accounting principle         $ 15 $ (1)
Ending balance $ 17,440   17,440      
Foreign currency translation adjustments [Member]            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Beginning balance (532) $ (396) (564) $ (420)    
Cumulative-effect adjustment from change in accounting principle         0 0
OCI before reclassifications 14 (86) 46 (62)    
Amounts reclassified from AOCI 0 0 0 0    
Net OCI 14 (86) 46 (62)    
Ending balance (518) (482) (518) (482)    
Financial instruments [Member]            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Beginning balance (153) (67) (82) (122)    
Cumulative-effect adjustment from change in accounting principle         (25) (3)
OCI before reclassifications (67) 19 (112) 85    
Amounts reclassified from AOCI 7 8 6 0    
Net OCI (60) 27 (106) 85    
Ending balance (213) (40) (213) (40)    
Pension and other postretirement benefits [Member]            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Beginning balance (132) (82) (118) (84)    
Cumulative-effect adjustment from change in accounting principle         (17) 0
OCI before reclassifications (7) 1 (6) 1    
Amounts reclassified from AOCI 22 2 24 4    
Net OCI 15 3 18 5    
Ending balance (117) (79) (117) (79)    
Total accumulated other comprehensive income (loss) [Member]            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Beginning balance (817) (545) (764) (626)    
Cumulative-effect adjustment from change in accounting principle         (42) $ (3)
OCI before reclassifications (60) (66) (72) 24    
Amounts reclassified from AOCI 29 10 30 4    
Net OCI (31) (56) (42) 28    
Ending balance (848) (601) (848) (601)    
San Diego Gas and Electric Company [Member]            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Beginning balance [1]     6,015      
Cumulative-effect adjustment from change in accounting principle         0  
Ending balance 6,335   6,335      
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]            
Beginning balance (12) (8) (10) (8)    
Cumulative-effect adjustment from change in accounting principle         (2)  
Amounts reclassified from AOCI 1   1      
Net OCI 1   1      
Ending balance (11) (8) (11) (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]            
Beginning balance (12) (8) (10) (8)    
Cumulative-effect adjustment from change in accounting principle         (2)  
Amounts reclassified from AOCI 1   1      
Net OCI 1   1      
Ending balance (11) (8) (11) (8)    
Southern California Gas Company [Member]            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Beginning balance [1]     4,258      
Cumulative-effect adjustment from change in accounting principle         (2)  
Ending balance 4,554   4,554      
Southern California Gas Company [Member] | Financial instruments [Member]            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Beginning balance (14) (13) (12) (13)    
Cumulative-effect adjustment from change in accounting principle         (2)  
Amounts reclassified from AOCI 0 0 0 0    
Net OCI 0 0 0 0    
Ending balance (14) (13) (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]            
Beginning balance (10) (8) (8) (8)    
Cumulative-effect adjustment from change in accounting principle         (2)  
Amounts reclassified from AOCI 4 1 4 1    
Net OCI 4 1 4 1    
Ending balance (6) (7) (6) (7)    
Southern California Gas Company [Member] | Total accumulated other comprehensive income (loss) [Member]            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Beginning balance (24) (21) (20) (21)    
Cumulative-effect adjustment from change in accounting principle         $ (4)  
Amounts reclassified from AOCI 4 1 4 1    
Net OCI 4 1 4 1    
Ending balance $ (20) $ (20) $ (20) $ (20)    
[1]
Derived from audited financial statements.