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Note 18 - Changes in Benefit Obligations Recognized in Other Comprehensive Loss (Income) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Amortization of:      
Total loss recognized in Other comprehensive (loss) income $ (36) $ 140 $ 98
Other Postretirement Benefit Plans [Member]      
Changes In Benefit Obligations Recognized In Other Comprehensive Loss Income [Line Items]      
Newly established loss 1 1  
Amortization of:      
Net actuarial gain 2 2  
Total loss recognized in Other comprehensive (loss) income $ 3 $ 3