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Note 21 - Derivatives Not Designated as Hedging Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Financial Instruments Owned At Fair Value [Abstract]        
Net loss from derivatives not designated as hedging instruments $ 2 $ 8 $ 8 $ 8