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Note 11 - Derivatives Not Designated as Hedging Instruments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financial Instruments Owned At Fair Value [Abstract]      
Net (loss) gain from derivatives not designated as hedging instruments $ (10) $ (21) $ 14