REVENUES - DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 3,030	$ 2,756	$ 9,257	$ 9,137
Utilities regulatory revenues	(3)	95	(57)	74
Other revenues	164	300	643	742
Total revenues	3,191	3,151	9,843	9,953
San Diego Gas and Electric Company
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,683	1,349	4,626	3,851
Utilities regulatory revenues	(73)	131	(101)	311
Total revenues	1,610	1,480	4,525	4,162
Southern California Gas Company
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,101	1,217	4,042	4,706
Utilities regulatory revenues	70	(36)	44	(237)
Total revenues	1,171	1,181	4,086	4,469
Utilities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	2,741	2,528	8,566	8,471
Utilities \| San Diego Gas and Electric Company
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,683	1,349	4,626	3,851
Utilities \| Southern California Gas Company
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,101	1,217	4,042	4,706
Energy-related businesses
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	289	228	691	666
Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,417	1,543	5,042	5,833
Gas \| San Diego Gas and Electric Company
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	190	218	694	789
Gas \| Southern California Gas Company
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,101	1,217	4,042	4,706
Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,613	1,213	4,215	3,304
Electric \| San Diego Gas and Electric Company
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,493	1,131	3,932	3,062
Electric \| Southern California Gas Company
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0	0
Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	3,207	3,168	9,904	10,015
Operating Segments \| Sempra California
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	2,736	2,518	8,532	8,430
Utilities regulatory revenues	(3)	95	(57)	74
Other revenues	0	0	0	0
Total revenues	2,733	2,613	8,475	8,504
Operating Segments \| Sempra California \| Utilities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	2,736	2,518	8,532	8,430
Operating Segments \| Sempra California \| Energy-related businesses
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0	0
Operating Segments \| Sempra California \| Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,247	1,390	4,611	5,378
Operating Segments \| Sempra California \| Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,489	1,128	3,921	3,052
Operating Segments \| Sempra Infrastructure
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	312	256	793	775
Utilities regulatory revenues	0	0	0	0
Other revenues	162	299	636	736
Total revenues	474	555	1,429	1,511
Operating Segments \| Sempra Infrastructure \| Utilities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	9	15	54	59
Operating Segments \| Sempra Infrastructure \| Energy-related businesses
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	303	241	739	716
Operating Segments \| Sempra Infrastructure \| Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	174	156	449	471
Operating Segments \| Sempra Infrastructure \| Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	138	100	344	304
Consolidating adjustments and Parent and other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(18)	(18)	(68)	(68)
Utilities regulatory revenues	0	0	0	0
Other revenues	2	1	7	6
Total revenues	(16)	(17)	(61)	(62)
Consolidating adjustments and Parent and other \| Utilities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(4)	(5)	(20)	(18)
Consolidating adjustments and Parent and other \| Energy-related businesses
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(14)	(13)	(48)	(50)
Consolidating adjustments and Parent and other \| Gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	(4)	(3)	(18)	(16)
Consolidating adjustments and Parent and other \| Electric
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ (14)	$ (15)	$ (50)	$ (52)