INCOME TAXES - Items included in Our Deferred Income Tax Assets (Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Postretirement benefits	$ 134	$ 172
Pension	337	109
Real estate impairments	141	205
State tax credits	57	57
Net operating loss carryforwards	169	162
Cellulosic biofuel producers credit	238	240
Other	371	390
Gross deferred tax assets	1,447	1,335
Valuation allowance	(146)	(142)
Net deferred tax assets	1,301	1,193
Property, plant and equipment	(610)	(668)
Timber installment notes	(277)	(277)
Other	(186)	(235)
Deferred tax liabilities	(1,073)	(1,180)
Net deferred tax assets (liabilities)	$ 228	$ 13