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
	Mar. 31, 2024	Mar. 31, 2023
Pension benefits
Net periodic benefit cost
Service cost	$ 7	$ 6
Interest cost	38	37
Expected return on plan assets	(50)	(44)
Amortization of net losses and prior service costs	3	1
Net periodic pension cost (income)	(2)	0
OPEB
Net periodic benefit cost
Interest cost	2	2
Amortization of net losses and prior service costs	(5)	(6)
Net periodic pension cost (income)	$ (3)	$ (4)