GENERAL INFORMATION AND OTHER FINANCIAL DATA - PENSION AND OTHER POSTRETIREMENT BENEFITS (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 34	$ 25	$ 99	$ 82
Interest cost	41	39	124	118
Expected return on assets	(40)	(42)	(131)	(127)
Amortization of:
Prior service cost (credit)	1	2	4	4
Actuarial loss (gain)	4	3	10	7
Settlement charges			9	0
Net periodic benefit cost (credit)	40	27	115	84
Regulatory adjustments	20	30	21	88
Total expense (income) recognized	60	57	136	172
Pension | SDG&E
Defined Benefit Plan Disclosure [Line Items]
Service cost	10	8	29	24
Interest cost	10	10	32	30
Expected return on assets	(10)	(9)	(33)	(29)
Amortization of:
Actuarial loss (gain)	3	2	6	4
Net periodic benefit cost (credit)	13	11	34	29
Regulatory adjustments	0	3	(7)	11
Total expense (income) recognized	13	14	27	40
Pension | SoCalGas
Defined Benefit Plan Disclosure [Line Items]
Service cost	21	15	59	49
Interest cost	26	24	78	75
Expected return on assets	(29)	(29)	(90)	(89)
Amortization of:
Prior service cost (credit)	1	1	3	3
Actuarial loss (gain)	1	1	1	1
Net periodic benefit cost (credit)	20	12	51	39
Regulatory adjustments	20	27	28	77
Total expense (income) recognized	40	39	79	116
PBOP
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	3	11	10
Interest cost	9	9	27	28
Expected return on assets	(19)	(17)	(53)	(52)
Amortization of:
Prior service cost (credit)	(1)	(1)	(2)	(2)
Actuarial loss (gain)	(4)	(5)	(12)	(17)
Settlement charges			0	0
Net periodic benefit cost (credit)	(11)	(11)	(29)	(33)
Regulatory adjustments	10	10	28	32
Total expense (income) recognized	(1)	(1)	(1)	(1)
PBOP | SDG&E
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1	2	2
Interest cost	3	2	6	6
Expected return on assets	(3)	(2)	(7)	(6)
Amortization of:
Actuarial loss (gain)	0	0	(1)	(1)
Net periodic benefit cost (credit)	0	1	0	1
Regulatory adjustments	0	(1)	0	(1)
Total expense (income) recognized	0	0	0	0
PBOP | SoCalGas
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	2	8	7
Interest cost	7	7	21	21
Expected return on assets	(15)	(14)	(45)	(44)
Amortization of:
Prior service cost (credit)	(1)	(1)	(2)	(2)
Actuarial loss (gain)	(4)	(5)	(10)	(15)
Net periodic benefit cost (credit)	(10)	(11)	(28)	(33)
Regulatory adjustments	10	11	28	33
Total expense (income) recognized	$ 0	$ 0	$ 0	$ 0