PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS - Net Periodic Benefit Cost Relating to Pension and Other Postemployment Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Pension benefits
Net periodic benefit cost
Service cost	$ 3	$ 3	$ 6	$ 9
Interest cost	34	45	68	90
Expected return on plan assets	(44)	(59)	(88)	(118)
Amortization of net losses and prior service costs	1	5	2	9
Net periodic pension cost (income)	(6)	(6)	(12)	(10)
OPEB
Net periodic benefit cost
Interest cost	2	2	4	4
Amortization of net losses and prior service costs	(4)	(5)	(8)	(10)
Net periodic pension cost (income)	$ (2)	$ (3)	$ (4)	$ (6)