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Note 6 - Income Taxes (Details) - Tax Effects of Temporary Differences and Carryforwards of Deferred Tax Assets and Liabilities - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
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Tax Effects of Temporary Differences and Carryforwards of Deferred Tax Assets and Liabilities [Abstract] |  |
Loss and tax credit carryforwards | $ 1,151 | $ 1,235
Other assets | 69 | 69
Asset impairments and restructuring reserves | 153 | 170
Postretirement medical and life benefits | 276 | 312
Other accrued liabilities | 265 | 246
Other employee benefits | 505 | 473
Gross deferred tax assets | 2,419 | 2,505
Valuation allowance | (238) | (298)
Total deferred tax assets | 2,181 | 2,207
Intangible and other assets | (181) | (152)
Fixed assets | (284) | (299)
Total deferred tax liabilities | (465) | (451)
Net deferred tax assets | $ 1,716 | $ 1,756

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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