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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance [1]     $ 23,373  
Ending balance $ 25,451   25,451  
Foreign currency translation adjustments [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (69) $ (745) (64) $ (607)
OCI before reclassifications (19) 17 (24) (121)
Amounts reclassified from AOCI 0 645 0 645
Net OCI (19) 662 (24) 524
Ending balance (88) (83) (88) (83)
Foreign currency translation adjustments [Member] | IEnova [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
AOCI associated with noncontrolling interests 24   24  
Financial instruments [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (239) (350) (331) (215)
OCI before reclassifications (36) (13) 37 (167)
Amounts reclassified from AOCI 10 2 29 21
Net OCI (26) (11) 66 (146)
Ending balance (265) (361) (265) (361)
Financial instruments [Member] | IEnova [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
AOCI associated with noncontrolling interests 14   14  
Pension and other postretirement benefits [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (91) (95) (105) (117)
OCI before reclassifications (2) (14) 5 2
Amounts reclassified from AOCI 2 11 9 17
Net OCI 0 (3) 14 19
Ending balance (91) (98) (91) (98)
Pension and other postretirement benefits [Member] | San Diego Gas and Electric Company [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Amounts reclassified from AOCI   3   3
Total accumulated other comprehensive income (loss) [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (399) (1,190) (500) (939)
OCI before reclassifications (57) (10) 18 (286)
Amounts reclassified from AOCI 12 658 38 683
Net OCI (45) 648 56 397
Ending balance (444) (542) (444) (542)
San Diego Gas and Electric Company [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance [1]     7,730  
Ending balance 8,128   8,128  
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 (10) (16) (10) (16)
Amounts reclassified from AOCI   4   4
Net OCI   4   4
Ending balance (10) 12 (10) 12
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 (10) (16) (10) (16)
Amounts reclassified from AOCI   4   4
Net OCI   4   4
Ending balance (10) 12 (10) 12
Southern California Gas Company [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance [1]     5,144  
Ending balance 5,571   5,571  
Southern California Gas Company [Member] | Financial instruments [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (13) (13) (13) (13)
Amounts reclassified from AOCI 0 0 0 0
Net OCI 0 0 0 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 (18) (10) (18) (10)
Amounts reclassified from AOCI 1 1 1 1
Net OCI (1) 1 (1) 1
Ending balance (17) (9) (17) (9)
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 (31) (23) (31) (23)
Amounts reclassified from AOCI 1 1 1 1
Net OCI (1) 1 (1) 1
Ending balance $ (30) $ (22) $ (30) $ (22)
[1] Derived from audited financial statements.