INCOME TAXES - Items Included in Our Deferred Income Tax Assets (Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Postretirement benefits	$ 102	$ 144
Pension	57	521
Real estate impairments	214	115
State tax credits	59	59
Net operating loss carryforwards	144	187
Cellulosic biofuel producers credit	80	240
Other	310	336
Gross deferred tax assets	966	1,602
Valuation allowance	(97)	(144)
Net deferred tax assets	869	1,458
Property, plant and equipment	(538)	(577)
Timber installment notes	(180)	(240)
Other	(165)	(185)
Deferred tax liabilities	(883)	(1,002)
Net deferred tax asset (liability)	$ (14)	$ 456