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Note 23 - Financial Instruments (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Fair Value, Inputs, Level 2 [Member]          
Long-term Debt, Fair Value $ 105   $ 105   $ 5
Fair value of current portion of long-term debt         378
Forward Contracts [Member]          
Gross fair value of foreign currency in an asset position 1   1   3
Gross fair value of foreign currency in a liability position 0   0   1
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]          
Derivative Asset, Notional Amount 390   390   $ 415
Designated as Hedging Instrument [Member]          
Derivatives Hedging Instruments $ 0 $ 0 $ 0 $ 0