Income Taxes (Schedule Of Tax Effects Of Temporary Differences And Carryforwards Of The Deferred Tax Assets And Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Abstract]
Loss and tax credit carryforwards	$ 1,923	$ 2,039
Capitalized research and development	33	47
Asset impairments and restructuring reserves	168	162
Postretirement medical and life benefits	357	347
Inventory	23	44
Fixed assets	89	78
Other accrued liabilities	268	241
Other employee benefits	486	398
Gross deferred tax assets	3,347	3,356
Valuation allowance	(210)	(219)
Total deferred tax assets	3,137	3,137
Intangible and other assets	(230)	(97)
Total deferred tax liabilities	(230)	(97)
Net deferred tax assets	$ 2,907	$ 3,040