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Note 17 - Changes in Benefit Obligations Recognized in Other Comprehensive (Loss) Income (Details) - Other Postretirement Benefit Plans [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Changes In Benefit Obligations Recognized In Other Comprehensive Loss Income [Line Items]    
Newly established loss $ (8) $ (2)
Total loss recognized in Other comprehensive (loss) income $ (8) $ (2)