SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	$ 106	$ 99	$ 212	$ 198
Interest cost	252	229	504	458
Expected return on plan assets	(264)	(254)	(527)	(507)
Amortization of prior service (credit)	0	(1)	(1)	(2)
Amortization of net actuarial loss (gain)	1	1	1	1
Net periodic benefit cost	95	74	189	148
Regulatory account transfer	(10)	(9)	(20)	(19)
Net periodic benefit cost	85	65	169	129
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	10	11	19	21
Interest cost	19	18	37	36
Expected return on plan assets	(38)	(35)	(75)	(70)
Amortization of prior service (credit)	0	0	1	1
Amortization of net actuarial loss (gain)	(5)	(5)	(11)	(11)
Net periodic benefit cost	(14)	(11)	(29)	(23)
Regulatory account transfer	0	0	0	0
Net periodic benefit cost	$ (14)	$ (11)	$ (29)	$ (23)