INCOME TAXES (Schedule of Deferred Tax Balances) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Property, Deferred Tax Assets	$ 0	$ 0
Loss and Credit Carryforwards, Deferred Tax Assets	70	82
Postretirement benefit obligations, deferred tax assets	802	818
Other accruals and reserves, deferred tax assets	297	263
Inventory, deferred tax assets	23	53
Other - net, deferred tax assets	7	2
Subtotal, deferred tax assets	1,199	1,218
Valuation allowances, deferred tax assets	(28)	(53)
Total, deferred tax assets	1,171	1,165
Property, deferred tax liabilities	193	197
Deferred Tax Liabilities, Loss and credit carryforward	0	0
Postretirement Benefits, Deferred Tax Liabilities	395	420
Other accruals and Reserves, Deferred Tax Liabilities	0	3
Inventory, deferred tax liabilities	0	0
Other - net, deferred tax liabilities	1	1
Total, deferred tax liabilities	$ 589	$ 621