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Note 18 - Effect of One-percentage Point Change in Assumed Healthcare Cost Trend Rates (Details) - Other Postretirement Benefit Plans [Member] $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
Effect Of One Percentage Point Change In Assumed Healthcare Cost Trend Rates [Line Items] |
Effect on postretirement benefit obligation | $ 5
Effect on postretirement benefit obligation | $ (4)

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- Definition Effect of one percentage point change in assumed healthcare cost trend rates. + References No definition available. + Details
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- Definition Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of increase in accumulated postretirement benefit obligation from one-percentage-point increase in assumed health care cost trend rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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