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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance [1]     $ 17,138  
OCI before reclassifications $ (139) $ (15) (211) $ 9
Amounts reclassified from AOCI 9 4 39 8
Net OCI (130) (11) (172) 17
Ending balance 18,620   18,620  
Foreign currency translation adjustments [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (518) (482) (564) (420)
Cumulative-effect adjustment from change in accounting principle     0 0
OCI before reclassifications (91) (16) (45) (78)
Amounts reclassified from AOCI 0 0 0 0
Net OCI (91) (16) (45) (78)
Ending balance (609) (498) (609) (498)
Financial instruments [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (213) (40) (82) (122)
Cumulative-effect adjustment from change in accounting principle     (25) (3)
OCI before reclassifications (41) 19 (153) 104
Amounts reclassified from AOCI 4 (4) 10 (4)
Net OCI (37) 15 (143) 100
Ending balance (250) (25) (250) (25)
Pension and other postretirement benefits [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (117) (79) (118) (84)
Cumulative-effect adjustment from change in accounting principle     (17) 0
OCI before reclassifications (7) (18) (13) (17)
Amounts reclassified from AOCI 5 8 29 12
Net OCI (2) (10) 16 (5)
Ending balance (119) (89) (119) (89)
Total accumulated other comprehensive income (loss) [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (848) (601) (764) (626)
Cumulative-effect adjustment from change in accounting principle     (42) (3)
Ending balance (978) (612) (978) (612)
San Diego Gas and Electric Company [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance [1]     6,015  
OCI before reclassifications   (6)   (6)
Amounts reclassified from AOCI     1  
Net OCI   (6) 1 (6)
Ending balance 6,920   6,920  
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 (11) (8) (10) (8)
Cumulative-effect adjustment from change in accounting principle     (2)  
OCI before reclassifications   (6)   (6)
Amounts reclassified from AOCI     1  
Net OCI   (6) 1 (6)
Ending balance (11) (14) (11) (14)
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 (11) (8) (10) (8)
Cumulative-effect adjustment from change in accounting principle     (2)  
Ending balance (11) (14) (11) (14)
Southern California Gas Company [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance [1]     4,258  
Amounts reclassified from AOCI 1   5 1
Net OCI 1   5 1
Ending balance 4,548   4,548  
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 1   1 0
Net OCI 1   1 0
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]        
Beginning balance (6) (7) (8) (8)
Cumulative-effect adjustment from change in accounting principle     (2)  
Amounts reclassified from AOCI 0   4 1
Net OCI 0   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 (20) (20) (20) (21)
Cumulative-effect adjustment from change in accounting principle     (4)  
Ending balance $ (19) $ (20) $ (19) $ (20)
[1]
Derived from audited financial statements.