Note 8 - Revenue (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Disaggregation Of Revenue [Line Items]
Contract liabilities	$ 61		$ 57
Revenue recognized, contract liabilities	20	$ 25
Contract with customer, cash payments received for liabilities that have been deferred	24	$ 19
Other Current Assets [Member]
Disaggregation Of Revenue [Line Items]
Contract assets	3		3
Other Current Liabilities [Member]
Disaggregation Of Revenue [Line Items]
Contract liabilities, current	47		43
Other Long-Term Liabilities [Member]
Disaggregation Of Revenue [Line Items]
Contract liabilities, non-current	$ 14		$ 14