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Note 15 - Income Taxes (Details Textual) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Tax Expense (Benefit), Total $ 34   $ (52)   $ 18 $ (32)
Effective Income Tax Rate Reconciliation, Percent, Total         (14.00%) 291.00%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount     (30)      
Goodwill, Impairment Loss $ 51   $ 51
Other Tax Expense (Benefit)   1 9      
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount   37 48      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement   $ (258)   $ (258)
Tax Adjustments, Settlements, and Unusual Provisions       $ 6    
Effective Income Tax Rate Reconciliation, Excluding Effects of Special Items, Percent         8.00% 29.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent         21.00%  
Foreign Tax Authority [Member]            
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount $ 56 4        
Domestic Tax Authority [Member]            
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount   $ 2   $ (22)