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Note 12 - Revenue (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Disaggregation Of Revenue [Line Items]          
Contract liabilities $ 56   $ 56   $ 48
Contract liabilities, current 32   32   34
Revenue recognized, contract liabilities 5 $ 4 30 $ 27  
Contract with customer, cash payments received for liabilities that have been deferred 20 $ 23 23 $ 30  
Other Current Assets [Member]          
Disaggregation Of Revenue [Line Items]          
Contract assets 2   2   3
Other Current Liabilities [Member]          
Disaggregation Of Revenue [Line Items]          
Contract liabilities, current 37   37   42
Other Long-Term Liabilities [Member]          
Disaggregation Of Revenue [Line Items]          
Contract liabilities, non-current $ 19   $ 19   $ 6