PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS - Summary of Net-of-Tax Amounts Recorded in OCI Relating to Pension and OPEB Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
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 $(14) in 2025, $(6) in 2024 and $31 in 2023	$ (20)	$ (15)	$ (103)
Amortization of gain (loss) to earnings, net of tax of $(3) in 2025, zero in 2024 and $(5) in 2023	(8)	(4)	13
Settlement charges, net of tax of zero in 2025 and 2024 and $(1) 2023	0	0	(2)
Pension and other employee benefits	(28)	(19)	(92)
Gain (loss) arising during the year, tax expense (benefit)	(14)	(6)	31
Amortization of loss to earnings, tax benefit	(3)	0	(5)
Settlement, tax benefit	$ 0	$ 0	$ (1)