SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	$ 99	$ 95
Interest cost	229	228
Expected return on plan assets	(253)	(245)
Amortization of prior service cost (credit)	(1)	(1)
Amortization of net actuarial gain	0	0
Net periodic benefit cost	74	77
Regulatory account transfer	10	6
Net periodic benefit cost	84	83
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	10	10
Interest cost	18	18
Expected return on plan assets	(35)	(33)
Amortization of prior service cost (credit)	1	1
Amortization of net actuarial gain	(6)	(5)
Net periodic benefit cost	(12)	(9)
Regulatory account transfer	0	0
Net periodic benefit cost	$ (12)	$ (9)