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Note 10 - Revenue (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Disaggregation Of Revenue [Line Items]          
Contract liabilities $ 58   $ 58   $ 64
Revenue recognized, contract liabilities 9 $ 4 34 $ 35  
Contract with customer, cash payments received for liabilities that have been deferred 19 $ 21 26 $ 31  
Other Current Assets [Member]          
Disaggregation Of Revenue [Line Items]          
Contract assets 2   2   2
Other Current Liabilities [Member]          
Disaggregation Of Revenue [Line Items]          
Contract liabilities, current 43   43   47
Other Long-Term Liabilities [Member]          
Disaggregation Of Revenue [Line Items]          
Contract liabilities, non-current $ 15   $ 15   $ 17