EMPLOYEE BENEFIT PLANS - NET PENSION EXPENSE (Details) - Qualified Defined Benefit [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 8	$ 12	$ 22	$ 34
Interest cost	27	17	81	49
Expected return on assets	28	32	85	96
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	(1)	0	(1)
Recognized actuarial loss (gain)	(5)	(2)	(17)	(6)
Wages and Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Net pension expense	8	12	22	34
Nonoperating Income (Expense) [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Net pension expense	$ 4	$ (14)	$ 13	$ (42)