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Note 9 - Commitments and Contingencies (Details) - Cash Expenditures For Pollution Prevention and Waste Treatment - USD ($)
$ in Millions
 4 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2013
Aug. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Successor [Member]        
Cash Expenditures For Pollution Prevention and Waste Treatment [Line Items]        
Cash expenditures for pollution prevention and waste treatment $ 7   $ 15 $ 15
Successor [Member] | Recurring Cost Pollution Prevention and Waste Treatment [Member]        
Cash Expenditures For Pollution Prevention and Waste Treatment [Line Items]        
Cash expenditures for pollution prevention and waste treatment 5   13 13
Successor [Member] | Capital Expenditures for Pollution Prevention and Waste Treatment [Member]        
Cash Expenditures For Pollution Prevention and Waste Treatment [Line Items]        
Cash expenditures for pollution prevention and waste treatment $ 2   $ 2 $ 2
Predecessor [Member]        
Cash Expenditures For Pollution Prevention and Waste Treatment [Line Items]        
Cash expenditures for pollution prevention and waste treatment   $ 16    
Predecessor [Member] | Recurring Cost Pollution Prevention and Waste Treatment [Member]        
Cash Expenditures For Pollution Prevention and Waste Treatment [Line Items]        
Cash expenditures for pollution prevention and waste treatment   $ 16