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GENERAL INFORMATION AND OTHER FINANCIAL DATA - CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
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         $ (1)
Amounts reclassified from AOCI $ 4 $ 5 8 $ 14  
AOCI, ending balance (612)   (612)    
Foreign currency translation adjustments [Member]          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
AOCI, beginning balance (482) (478) (420) (527)  
Cumulative-effect adjustment from change in accounting principle         0
OCI before reclassifications (16) 27 (78) 76  
Amounts reclassified from AOCI 0 0 0 0  
Net OCI (16) 27 (78) 76  
AOCI, ending balance (498) (451) (498) (451)  
Financial instruments [Member]          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
AOCI, beginning balance (40) (147) (122) (125)  
Cumulative-effect adjustment from change in accounting principle         (3)
OCI before reclassifications 19 8 104 (20)  
Amounts reclassified from AOCI (4) (2) (4) 4  
Net OCI 15 6 100 (16)  
AOCI, ending balance (25) (141) (25) (141)  
Pension and other postretirement benefits [Member]          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
AOCI, beginning balance (79) (93) (84) (96)  
Cumulative-effect adjustment from change in accounting principle         0
OCI before reclassifications (18) 0 (17) 0  
Amounts reclassified from AOCI 8 7 12 10  
Net OCI (10) 7 (5) 10  
AOCI, ending balance (89) (86) (89) (86)  
Total accumulated other comprehensive income (loss) [Member]          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
AOCI, beginning balance (601) (718) (626) (748)  
Cumulative-effect adjustment from change in accounting principle         $ (3)
OCI before reclassifications (15) 35 9 56  
Amounts reclassified from AOCI 4 5 8 14  
Net OCI (11) 40 17 70  
AOCI, ending balance (612) (678) (612) (678)  
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 1 0 1  
AOCI, ending balance (14)   (14)    
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)  
OCI before reclassifications (6)   (6)    
Amounts reclassified from AOCI   1   1  
Net OCI (6) 1 (6) 1  
AOCI, ending balance (14) (7) (14) (7)  
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)  
OCI before reclassifications (6)   (6)    
Amounts reclassified from AOCI   1   1  
Net OCI (6) 1 (6) 1  
AOCI, ending balance (14) (7) (14) (7)  
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  
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  
Net OCI     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 (7) (8) (8) (9)  
Amounts reclassified from AOCI     1 1  
Net OCI     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 (20) (21) (21) (22)  
Amounts reclassified from AOCI     1 1  
Net OCI     1 1  
AOCI, ending balance $ (20) $ (21) $ (20) $ (21)  
[1] Derived from audited financial statements.