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Note 23 - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]    
Currency translation adjustments $ (85) $ (96)
Pension and other postretirement benefit plan changes (306) (342)
Ending balance $ (391) $ (438)