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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Pension benefits
Net periodic benefit cost
Service cost	$ 4	$ 7	$ 11	$ 13
Interest cost	38	35	76	72
Expected return on plan assets	(49)	(43)	(99)	(87)
Amortization of net losses and prior service costs	4	1	7	2
Net periodic pension cost (income)	(3)	0	(5)	0
OPEB
Net periodic benefit cost
Interest cost	2	2	4	4
Amortization of net losses and prior service costs	(5)	(6)	(10)	(12)
Net periodic pension cost (income)	$ (3)	$ (4)	$ (6)	$ (8)