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Note 6 - Summary of Other Long-term Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Summary Of Other Long Term Liabilities [Abstract]    
Workers compensation $ 82 $ 83
Asset retirement obligations 48 48
Deferred taxes 13 14
Environmental liabilities 10 10
Other 10 24
Total $ 163 $ 179