INCOME TAXES - Items Included in Our Deferred Income Tax Assets (Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Components Of Deferred Tax Assets And Liabilities [Abstract]
Pension and post-employment benefits	$ 96	$ 207
State tax credits	42	48
Depletion	13	14
Environmental Reserves	14	13
Incentive compensation	19	19
Intercompany land sales	15	15
Workers compensation	17	18
Other reserves	14	17
Other	70	78
Gross deferred tax assets	300	429
Valuation allowance	(50)	(66)
Net deferred tax assets	250	363
Property, plant and equipment	(258)	(239)
Other	(21)	(28)
Net deferred tax liabilities	(279)	(267)
Net deferred tax asset (liability)	$ (29)	$ 96