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Note 19 - Derivatives Not Designated as Hedging Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Financial Instruments Owned At Fair Value [Abstract]        
Net (loss) gain from derivatives not designated as hedging instruments $ (2) $ 3 $ (1) $ 20