Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Postretirement benefit accruals	$ 193	$ 229
Pension obligations	725	1,620
Alternative minimum and other tax credits	515	752
Net operating loss carryforwards	610	579
Compensation reserves	281	242
Other	284	406
Gross deferred income tax assets	2,608	3,828
Less: valuation allowance	(413)	(400)
Net deferred income tax asset	2,195	3,428
Deferred tax liabilities, intangible assets	(304)	(378)
Plants, properties and equipment	(2,919)	(3,126)
Forestlands and related installment sales	(2,307)	(2,511)
Gross deferred income tax liabilities	(5,530)	(6,015)
Net deferred income tax liability	$ (3,335)	$ (2,587)