SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	$ 106	$ 99	$ 318	$ 297
Interest cost	252	229	756	687
Expected return on plan assets	(263)	(254)	(790)	(761)
Amortization of prior service (credit)	(1)	0	(2)	(2)
Amortization of net actuarial loss (gain)	0	0	1	1
Net periodic benefit cost	94	74	283	222
Regulatory account transfer	(10)	(10)	(30)	(29)
Net periodic benefit cost	84	64	253	193
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	9	10	28	31
Interest cost	18	17	55	53
Expected return on plan assets	(37)	(35)	(112)	(105)
Amortization of prior service (credit)	1	1	2	2
Amortization of net actuarial loss (gain)	(6)	(6)	(17)	(17)
Net periodic benefit cost	(15)	(13)	(44)	(36)
Regulatory account transfer	0	0	0	0
Net periodic benefit cost	$ (15)	$ (13)	$ (44)	$ (36)