SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	$ 99	$ 95	$ 198	$ 190
Interest cost	229	229	458	457
Expected return on plan assets	(254)	(246)	(507)	(491)
Amortization of prior service (credit)	(1)	(1)	(2)	(2)
Amortization of net actuarial (gain) loss	1	0	1	0
Net periodic benefit cost	74	77	148	154
Regulatory account transfer	(9)	(6)	(19)	(13)
Net periodic benefit cost	65	71	129	141
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	11	9	21	19
Interest cost	18	19	36	37
Expected return on plan assets	(35)	(33)	(70)	(66)
Amortization of prior service (credit)	0	0	1	1
Amortization of net actuarial (gain) loss	(5)	(4)	(11)	(9)
Net periodic benefit cost	(11)	(9)	(23)	(18)
Regulatory account transfer	0	0	0	0
Net periodic benefit cost	$ (11)	$ (9)	$ (23)	$ (18)