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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance [1]     $ 23,373  
Ending balance $ 24,554   24,554  
Total accumulated other comprehensive income (loss) [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (444) $ (542) (500) $ (939)
OCI before reclassifications 7 13 25 (273)
Amounts reclassified from AOCI 19 16 57 699
Net OCI 26 29 82 426
Ending balance (418) (513) (418) (513)
Foreign currency translation adjustments [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (88) (83) (64) (607)
OCI before reclassifications 0 6 (24) (115)
Amounts reclassified from AOCI 0 0 0 645
Net OCI 0 6 (24) 530
Ending balance (88) (77) (88) (77)
Foreign currency translation adjustments [Member] | IEnova [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
AOCI associated with noncontrolling interests (4) 3 20 3
Financial instruments [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (265) (361) (331) (215)
OCI before reclassifications 15 14 52 (153)
Amounts reclassified from AOCI 16 4 45 25
Net OCI 31 18 97 (128)
Ending balance (234) (343) (234) (343)
Financial instruments [Member] | IEnova [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
AOCI associated with noncontrolling interests (2) 2 12 2
Pension and other postretirement benefits [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (91) (98) (105) (117)
OCI before reclassifications (8) (7) (3) (5)
Amounts reclassified from AOCI 3 12 12 29
Net OCI (5) 5 9 24
Ending balance (96) (93) (96) (93)
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
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 8,334   8,334  
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) (12) (10) (16)
Amounts reclassified from AOCI 1   1 4
Net OCI (1)   1 4
Ending balance (9) 12 (9) 12
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) (12) (10) (16)
Amounts reclassified from AOCI 1   1 4
Net OCI (1)   1 4
Ending balance (9) 12 (9) 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 5,246   5,246  
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 (30) (22) (31) (23)
Amounts reclassified from AOCI 1   2 1
Net OCI (1)   (2) 1
Ending balance (29) (22) (29) (22)
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
Net OCI 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 (17) (9) (18) (10)
Amounts reclassified from AOCI 1   2 1
Net OCI (1)   (2) 1
Ending balance $ (16) $ (9) $ (16) $ (9)
[1] Derived from audited financial statements.