PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS - Summary of Net-of-Tax Amounts Recorded in OCI Relating to Pension and OPEB Plans (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Summary of the net-of-tax amounts recorded in OCI relating to pension and OPEB plans
Gain (loss) arising during the year, net of tax of $(6) in 2024, $31 in 2023 and $4 in 2022	$ (15,000,000)	$ (103,000,000)	$ (61,000,000)
Amortization of gain (loss) to earnings, net of tax of zero in 2024, $(5) in 2023 and $6 in 2022	(4,000,000)	13,000,000	21,000,000
Settlement charges, net of tax of zero in 2024, $(1) in 2023 and zero 2022	0	(2,000,000)	1,000,000
Pension and other employee benefits	(19,000,000)	(92,000,000)	(39,000,000)
Gain (loss) arising during the year, tax expense (benefit)	(6,000,000)	31,000,000	4,000,000
Amortization of loss to earnings, tax benefit	0	(5,000,000)	6,000,000
Settlement, tax benefit	$ 0	$ (1,000,000)	$ 0