GENERAL INFORMATION AND OTHER FINANCIAL DATA - PENSION AND OTHER POSTRETIREMENT BENEFITS (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 32	$ 28
Interest cost	42	40
Expected return on assets	(45)	(43)
Amortization of:
Prior service [cost (credit)]	1	1
Actuarial [loss (gain)]	3	2
Net periodic benefit [cost (credit)]	33	28
Regulatory adjustments	(25)	29
Total expense recognized	8	57
Pension | SDG&E
Defined Benefit Plan Disclosure [Line Items]
Service cost	10	8
Interest cost	11	10
Expected return on assets	(12)	(10)
Amortization of:
Actuarial [loss (gain)]	2	1
Net periodic benefit [cost (credit)]	11	9
Regulatory adjustments	(10)	4
Total expense recognized	1	13
Pension | SoCalGas
Defined Benefit Plan Disclosure [Line Items]
Service cost	19	17
Interest cost	26	25
Expected return on assets	(30)	(29)
Amortization of:
Prior service [cost (credit)]	1	1
Actuarial [loss (gain)]	0	0
Net periodic benefit [cost (credit)]	16	14
Regulatory adjustments	(15)	25
Total expense recognized	1	39
PBOP
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	4
Interest cost	9	9
Expected return on assets	(17)	(17)
Amortization of:
Prior service [cost (credit)]	(1)	(1)
Actuarial [loss (gain)]	(4)	(6)
Net periodic benefit [cost (credit)]	(9)	(11)
Regulatory adjustments	9	11
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)
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	(15)	(15)
Amortization of:
Prior service [cost (credit)]	(1)	(1)
Actuarial [loss (gain)]	(3)	(5)
Net periodic benefit [cost (credit)]	(9)	(11)
Regulatory adjustments	9	11
Total expense recognized	$ 0	$ 0