GENERAL INFORMATION AND OTHER FINANCIAL DATA - PENSION AND OTHER POSTRETIREMENT BENEFITS (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 32	$ 32
Interest cost	45	42
Expected return on assets	(45)	(45)
Amortization of:
Prior service cost (credit)	1	1
Actuarial loss (gain)	3	3
Settlement charges	4	0
Net periodic benefit cost (credit)	40	33
Regulatory adjustments	(28)	(25)
Total expense recognized	12	8
Pension | SDG&E
Defined Benefit Plan Disclosure [Line Items]
Service cost	9	10
Interest cost	12	11
Expected return on assets	(12)	(12)
Amortization of:
Actuarial loss (gain)	2	2
Net periodic benefit cost (credit)	11	11
Regulatory adjustments	(10)	(10)
Total expense recognized	1	1
Pension | SoCalGas
Defined Benefit Plan Disclosure [Line Items]
Service cost	19	19
Interest cost	28	26
Expected return on assets	(30)	(30)
Amortization of:
Prior service cost (credit)	1	1
Actuarial loss (gain)	1	0
Settlement charges	4	0
Net periodic benefit cost (credit)	23	16
Regulatory adjustments	(18)	(15)
Total expense recognized	5	1
PBOP
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	4
Interest cost	10	9
Expected return on assets	(16)	(17)
Amortization of:
Prior service cost (credit)	(1)	(1)
Actuarial loss (gain)	(3)	(4)
Settlement charges	0	0
Net periodic benefit cost (credit)	(7)	(9)
Regulatory adjustments	7	9
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	(2)	(3)
Amortization of:
Actuarial loss (gain)	(1)	0
Net periodic benefit cost (credit)	0	0
Regulatory adjustments	0	0
Total expense recognized	0	0
PBOP | SoCalGas
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3
Interest cost	7	7
Expected return on assets	(14)	(15)
Amortization of:
Prior service cost (credit)	(1)	(1)
Actuarial loss (gain)	(2)	(3)
Settlement charges	0	0
Net periodic benefit cost (credit)	(7)	(9)
Regulatory adjustments	7	9
Total expense recognized	$ 0	$ 0