REVENUES - DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 3,033	$ 2,470	$ 6,722	$ 5,611
Utilities regulatory revenues	303	210	328	182
Other revenues	211	61	317	207
Total revenues	3,547	2,741	7,367	6,000
Utilities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	2,590	2,224	6,002	5,097
Energy-related businesses
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	443	246	720	514
Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,827	1,385	4,272	3,503
Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,206	1,085	2,450	2,108
Operating Segments | San Diego Gas and Electric Company
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,250	1,170	2,751	2,386
Utilities regulatory revenues	149	148	93	269
Other revenues	0	0	0	0
Total revenues	1,399	1,318	2,844	2,655
Operating Segments | San Diego Gas and Electric Company | Utilities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,250	1,170	2,751	2,386
Operating Segments | San Diego Gas and Electric Company | Energy-related businesses
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0	0
Operating Segments | San Diego Gas and Electric Company | Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	159	162	489	435
Operating Segments | San Diego Gas and Electric Company | Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,091	1,008	2,262	1,951
Operating Segments | Southern California Gas Company
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,347	1,062	3,259	2,719
Utilities regulatory revenues	154	62	235	(87)
Other revenues	0	0	0	0
Total revenues	1,501	1,124	3,494	2,632
Operating Segments | Southern California Gas Company | Utilities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,347	1,062	3,259	2,719
Operating Segments | Southern California Gas Company | Energy-related businesses
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0	0
Operating Segments | Southern California Gas Company | Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,347	1,062	3,259	2,719
Operating Segments | Southern California Gas Company | Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0	0
Operating Segments | Sempra Infrastructure
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	477	277	797	573
Utilities regulatory revenues	0	0	0	0
Other revenues	212	64	316	217
Total revenues	689	341	1,113	790
Operating Segments | Sempra Infrastructure | Utilities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	20	17	48	44
Operating Segments | Sempra Infrastructure | Energy-related businesses
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	457	260	749	529
Operating Segments | Sempra Infrastructure | Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	340	185	569	397
Operating Segments | Sempra Infrastructure | Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	137	92	228	176
Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(41)	(39)	(85)	(67)
Utilities regulatory revenues	0	0	0	0
Other revenues	(1)	(3)	1	(10)
Total revenues	(42)	(42)	(84)	(77)
Consolidation, Eliminations | Utilities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(27)	(25)	(56)	(52)
Consolidation, Eliminations | Energy-related businesses
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(14)	(14)	(29)	(15)
Consolidation, Eliminations | Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(19)	(24)	(45)	(48)
Consolidation, Eliminations | Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ (22)	$ (15)	$ (40)	$ (19)