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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 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance [1]     $ 19,929    
OCI before reclassifications $ (10) $ (60) (286) $ (72)  
Amounts reclassified from AOCI 658 29 683 30  
Net OCI 648 (31) 397 (42)  
Ending balance 23,606   23,606   $ 19,929 [1]
Foreign currency translation adjustments [Member]          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance (745) (532) (607) (564) (564)
OCI before reclassifications 17 14 (121) 46  
Amounts reclassified from AOCI 645 0 645 0  
Net OCI 662 14 524 46  
Ending balance (83) (518) (83) (518) (607)
Financial instruments [Member]          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance (350) (153) (215) (82) (82)
OCI before reclassifications (13) (67) (167) (112)  
Amounts reclassified from AOCI 2 7 21 6  
Net OCI (11) (60) (146) (106)  
Ending balance (361) (213) (361) (213) (215)
Pension and other postretirement benefits [Member]          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance (95) (132) (117) (118) (118)
OCI before reclassifications (14) (7) 2 (6)  
Amounts reclassified from AOCI 11 22 17 24  
Net OCI (3) 15 19 18  
Ending balance (98) (117) (98) (117) (117)
Total accumulated other comprehensive income (loss) [Member]          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance (1,190) (817) (939) (764) (764)
Ending balance (542) (848) (542) (848) (939)
San Diego Gas and Electric Company [Member]          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance [1]     7,100    
Amounts reclassified from AOCI 4 1 4 1  
Net OCI 4 1 4 1  
Ending balance 7,359   7,359   7,100 [1]
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 (16) (12) (16) (10) (10)
Amounts reclassified from AOCI 4 1 4 1  
Net OCI 4 1 4 1  
Ending balance (12) (11) (12) (11) (16)
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 (16) (12) (16) (10) (10)
Ending balance (12) (11) (12) (11) (16)
Southern California Gas Company [Member]          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance [1]     4,748    
Amounts reclassified from AOCI 1 4 1 4  
Net OCI 1 4 1 4  
Ending balance 5,148   5,148   4,748 [1]
Southern California Gas Company [Member] | Financial instruments [Member]          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance (13) (14) (13) (12) (12)
Amounts reclassified from AOCI 0 0 0 0  
Net OCI 0 0 0 0  
Ending balance (13) (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) (10) (10) (8) (8)
Amounts reclassified from AOCI 1 4 1 4  
Net OCI 1 4 1 4  
Ending balance (9) (6) (9) (6) (10)
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 (23) (24) (23) (20) (20)
Ending balance $ (22) $ (20) (22) (20) (23)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Foreign currency translation adjustments [Member]          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance       0 0
Cumulative Effect, Period of Adoption, Adjustment [Member] | Financial instruments [Member]          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance       (25) (25)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Pension and other postretirement benefits [Member]          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance       (17) (17)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Total accumulated other comprehensive income (loss) [Member]          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance       (42) (42)
Cumulative Effect, Period of Adoption, Adjustment [Member] | 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       (2) (2)
Cumulative Effect, Period of Adoption, Adjustment [Member] | 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       (2) (2)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Southern California Gas Company [Member] | Financial instruments [Member]          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance       (2) (2)
Cumulative Effect, Period of Adoption, Adjustment [Member] | 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       (2) (2)
Cumulative Effect, Period of Adoption, Adjustment [Member] | 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       $ (4) (4)
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]          
Amounts reclassified from AOCI     $ (3)    
Southern California Gas Company [Member] | Pension and other postretirement benefits [Member]          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Amounts reclassified from AOCI         $ (4)
[1]
Derived from audited financial statements.