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Note 25 - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]    
Currency translation adjustments $ (96) $ (85)
Pension and other postretirement benefit plan changes (315) (306)
Ending balance $ (411) $ (391)