GENERAL INFORMATION AND OTHER FINANCIAL DATA - PENSION AND OTHER POSTRETIREMENT BENEFITS (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 34	$ 32
Interest cost	45	45
Expected return on assets	(45)	(45)
Amortization of:
Prior service cost (credit)	1	1
Actuarial loss (gain)	1	3
Settlement charges	0	4
Special termination benefits	0	0
Net periodic benefit cost (credit)	36	40
Regulatory adjustments	(28)	(28)
Total expense recognized	8	12
Pension | SDG&E
Defined Benefit Plan Disclosure [Line Items]
Service cost	10	9
Interest cost	12	12
Expected return on assets	(13)	(12)
Amortization of:
Actuarial loss (gain)	1	2
Special termination benefits	0	0
Net periodic benefit cost (credit)	10	11
Regulatory adjustments	(10)	(10)
Total expense recognized	0	1
Pension | SoCalGas
Defined Benefit Plan Disclosure [Line Items]
Service cost	19	19
Interest cost	28	28
Expected return on assets	(30)	(30)
Amortization of:
Prior service cost (credit)	1	1
Actuarial loss (gain)	0	1
Settlement charges	0	4
Special termination benefits	0	0
Net periodic benefit cost (credit)	18	23
Regulatory adjustments	(18)	(18)
Total expense recognized	0	5
PBOP
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3
Interest cost	11	10
Expected return on assets	(18)	(16)
Amortization of:
Prior service cost (credit)	(1)	(1)
Actuarial loss (gain)	(3)	(3)
Settlement charges	0	0
Special termination benefits	18	0
Net periodic benefit cost (credit)	10	(7)
Regulatory adjustments	(10)	7
Total expense recognized	0	0
PBOP | SDG&E
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1
Interest cost	2	2
Expected return on assets	(3)	(2)
Amortization of:
Actuarial loss (gain)	0	(1)
Special termination benefits	6	0
Net periodic benefit cost (credit)	6	0
Regulatory adjustments	(6)	0
Total expense recognized	0	0
PBOP | SoCalGas
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	3
Interest cost	8	7
Expected return on assets	(15)	(14)
Amortization of:
Prior service cost (credit)	(1)	(1)
Actuarial loss (gain)	(2)	(2)
Settlement charges	0	0
Special termination benefits	12	0
Net periodic benefit cost (credit)	4	(7)
Regulatory adjustments	(4)	7
Total expense recognized	$ 0	$ 0