REVENUES - DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 2,894	$ 3,106	$ 11,675	$ 9,828
Utilities regulatory revenues	197	357	76	685
Other revenues	243	154	1,478	471
Total revenues	3,334	3,617	13,229	10,984
Utilities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	2,541	2,587	10,815	8,589
Energy-related businesses
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	353	519	860	1,239
Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,506	1,738	7,750	6,010
Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,388	1,368	3,925	3,818
Operating Segments | San Diego Gas and Electric Company
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,438	1,383	4,603	4,134
Utilities regulatory revenues	4	186	(246)	279
Other revenues	0	0	0	0
Total revenues	1,442	1,569	4,357	4,413
Operating Segments | San Diego Gas and Electric Company | Utilities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,438	1,383	4,603	4,134
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	182	175	988	664
Operating Segments | San Diego Gas and Electric Company | Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,256	1,208	3,615	3,470
Operating Segments | Southern California Gas Company
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,120	1,214	6,252	4,473
Utilities regulatory revenues	193	171	322	406
Other revenues	0	0	0	0
Total revenues	1,313	1,385	6,574	4,879
Operating Segments | Southern California Gas Company | Utilities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,120	1,214	6,252	4,473
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	1,120	1,214	6,252	4,473
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	387	551	983	1,348
Utilities regulatory revenues	0	0	0	0
Other revenues	242	146	1,502	462
Total revenues	629	697	2,485	1,810
Operating Segments | Sempra Infrastructure | Utilities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	18	19	67	67
Operating Segments | Sempra Infrastructure | Energy-related businesses
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	369	532	916	1,281
Operating Segments | Sempra Infrastructure | Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	234	379	605	948
Operating Segments | Sempra Infrastructure | Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	153	172	378	400
Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(51)	(42)	(163)	(127)
Utilities regulatory revenues	0	0	0	0
Other revenues	1	8	(24)	9
Total revenues	(50)	(34)	(187)	(118)
Consolidation, Eliminations | Utilities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(35)	(29)	(107)	(85)
Consolidation, Eliminations | Energy-related businesses
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(16)	(13)	(56)	(42)
Consolidation, Eliminations | Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(30)	(30)	(95)	(75)
Consolidation, Eliminations | Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ (21)	$ (12)	$ (68)	$ (52)