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
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)

Effect of one percentage point change in assumed healthcare cost trend rates.

No definition available.

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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

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