EMPLOYEE BENEFIT PLANS - NET PENSION EXPENSE (Details) - Qualified Defined Benefit - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 7	$ 7	$ 14	$ 14
Interest cost	32	27	65	54
Expected return on assets	37	32	74	64
Recognized actuarial loss	(3)	(4)	(6)	(9)
Wages and Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Net pension expense	7	7	14	14
Nonoperating Income (Expense)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Net pension expense	$ (2)	$ (1)	$ (3)	$ (1)