SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	$ 94	$ 144	$ 284	$ 432
Interest cost	228	173	685	519
Expected return on plan assets	(245)	(297)	(736)	(892)
Amortization of prior service cost	(1)	(1)	(3)	(3)
Amortization of net actuarial loss	1	0	1	1
Net periodic benefit cost	77	19	231	57
Regulatory account transfer	6	64	19	191
Net periodic benefit cost	83	83	250	248
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	10	15	29	46
Interest cost	18	13	55	40
Expected return on plan assets	(33)	(32)	(99)	(97)
Amortization of prior service cost	1	2	2	5
Amortization of net actuarial loss	(5)	(10)	(14)	(30)
Net periodic benefit cost	(9)	(12)	(27)	(36)
Regulatory account transfer	0	0	0	0
Net periodic benefit cost	$ (9)	$ (12)	$ (27)	$ (36)