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Note 23 - Financial Instruments (Details Textual) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Inputs, Level 2 [Member]    
Long-term Debt, Fair Value $ 18 $ 5
Fair value of current portion of long-term debt 391 378
Forward Contracts [Member]    
Gross fair value of foreign currency in an asset position 3 3
Gross fair value of foreign currency in a liability position 0 1
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]    
Derivative Asset, Notional Amount 411 $ 415
Designated as Hedging Instrument [Member]    
Derivatives Hedging Instruments $ 0