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Note 26 - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]    
Currency translation adjustments $ (90) $ (96)
Pension and other postretirement benefit plan changes (327) (315)
Ending balance $ (417) $ (411)