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Note 16 - Restructuring Reserve Activity (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2019
Restructuring Cost And Reserve [Line Items]      
Beginning Balance $ 7 $ 8 $ 8
Charges   2  
Utilization/cash payments (2) (2)  
Other adjustments and reclasses [1] (1) (1)  
Ending Balance 7 7 7
Continuing Operations [Member]      
Restructuring Cost And Reserve [Line Items]      
Charges 2    
Discontinued Operations [Member]      
Restructuring Cost And Reserve [Line Items]      
Charges 1   1
Severance Reserve [Member]      
Restructuring Cost And Reserve [Line Items]      
Beginning Balance [2] 5 6 6
Charges [2]   2  
Utilization/cash payments [2] (2) (2)  
Other adjustments and reclasses [1],[2] (1) (1)  
Ending Balance [2] 5 5 5
Severance Reserve [Member] | Continuing Operations [Member]      
Restructuring Cost And Reserve [Line Items]      
Charges [2] 2    
Severance Reserve [Member] | Discontinued Operations [Member]      
Restructuring Cost And Reserve [Line Items]      
Charges [2] 1    
Exit Costs Reserve [Member]      
Restructuring Cost And Reserve [Line Items]      
Beginning Balance [2] 2 2 2
Ending Balance [2] $ 2 $ 2 $ 2
[1] Represents severance charges funded from pension plan assets, which were reclassified to Pension and other postretirement liabilities.
[2] The severance and exit costs reserves require the outlay of cash, while long-lived asset impairments and inventory write-downs represent non-cash items.