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Note 21 - Derivatives Not Designated as Hedging Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Financial Instruments Owned At Fair Value [Abstract]      
Net gain (loss) from derivatives not designated as hedging instruments $ 6 $ (4) $ 6