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, 2023	Mar. 31, 2022
Pension benefits
Net periodic benefit cost
Service cost	$ 6	$ 19
Interest cost	37	24
Expected return on plan assets	(44)	(39)
Amortization of net losses and prior service costs	1	12
Net periodic pension cost (income)	0	16
OPEB
Net periodic benefit cost
Interest cost	2	1
Amortization of net losses and prior service costs	(6)	(3)
Net periodic pension cost (income)	$ (4)	$ (2)