SEGMENT INFORMATION - Revenue By Services (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]
Energy-related businesses	$ 528	$ 512	$ 1,408	$ 1,360
Revenues from contracts with customers	2,756	2,569	9,137	8,750
Revenues	3,151	2,776	9,953	9,427
Operating Segments After Reconciling Items And Eliminations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues from contracts with customers	2,756	2,570	9,137	8,751
Total other revenues	395	207	816	677
Operating Segments After Reconciling Items And Eliminations | Sempra California
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenues	2,513	2,388	8,412	8,113
Energy-related businesses	0	0	0	0
Revenues from contracts with customers	2,513	2,388	8,412	8,113
Utilities	95	(138)	74	(107)
Energy-related businesses	0	0	0	0
Total other revenues	95	(138)	74	(107)
Operating Segments After Reconciling Items And Eliminations | Sempra Infrastructure
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenues	15	15	59	63
Energy-related businesses	228	167	666	575
Revenues from contracts with customers	243	182	725	638
Utilities	0	0	0	0
Energy-related businesses	300	345	742	784
Total other revenues	300	345	742	784
Segment revenues
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	3,168	2,794	10,015	9,488
Segment revenues | Sempra California
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues from contracts with customers	2,518	2,394	8,430	8,129
Revenues	2,613	2,256	8,504	8,022
Segment revenues | Sempra Infrastructure
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues from contracts with customers	256	194	775	688
Revenues	555	538	1,511	1,466
Adjustments
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	0	(1)	0	(1)
Intersegment revenues and eliminations
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	(17)	(17)	(62)	(60)
Intersegment revenues and eliminations | Sempra California
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenues	(5)	(6)	(18)	(16)
Energy-related businesses	0	0	0	0
Revenues	(5)	(6)	(18)	(16)
Intersegment revenues and eliminations | Sempra Infrastructure
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating revenues	0	0	0	0
Energy-related businesses	(12)	(11)	(44)	(44)
Revenues	$ (12)	$ (11)	$ (44)	$ (44)