INCOME TAXES (Schedule of Deferred Tax Balances) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Property, Plant and Equipment	$ 22	$ 14
Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards	34	39
Postretirement benefit obligations, Deferred Tax Assets	318	275
Other accruals and reserves, Deferred Tax Assets	313	320
Inventory, Deferred Tax Assets	4	5
Other - net, deferred tax assets	19	20
Subtotal, deferred tax assets	(710)	(673)
Valuation allowances, deferred tax assets	(18)	(21)
Total, deferred tax assets	692	652
Property, Deferred Tax Liabilities	194	145
Tax loss and credit carryforwards, Deferred Tax Liabilities,	0	0
Postretirement benefit obligations, Deferred Tax Liabilities	0	0
Other accruals and reserves, Deferred Tax Liabilities	4	0
Inventory, deferred tax liabilities	0	0
Other - net, deferred tax liabilities	0	0
Total, deferred tax liabilities	$ 198	$ 145