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Note 11 - Financial Instruments (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Inputs, Level 2 [Member]      
Long-term Debt, Fair Value $ 348 $ 406  
Forward Contracts [Member]      
Gross fair value of foreign currency 7    
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]      
Derivative Asset, Notional Amount 534 340  
Designated as Hedging Instrument [Member]      
Derivatives Hedging Instruments $ 0 $ 0 $ 0