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Note 20 - Changes in Benefit Obligations Recognized in Other Comprehensive Loss (Income) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Changes In Benefit Obligations Recognized In Other Comprehensive Loss Income [Line Items]    
Total gain recognized in Other comprehensive (loss) income $ 9 $ (36)
Other Postretirement Benefits Plan [Member]    
Changes In Benefit Obligations Recognized In Other Comprehensive Loss Income [Line Items]    
Newly established loss (gain) (6)  
Total gain recognized in Other comprehensive (loss) income $ (6)