EMPLOYEE BENEFIT PLANS - NET PENSION EXPENSE (Details) - Qualified Defined Benefit - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 7	$ 7	$ 21	$ 21
Interest cost	33	28	98	82
Expected return on assets	37	33	111	97
Recognized actuarial loss	(3)	(4)	(9)	(13)
Wages and Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Net pension expense	7	7	21	21
Nonoperating Income (Expense)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Net pension expense	$ (1)	$ (1)	$ (4)	$ (2)