Note 13 - Revenue (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Disaggregation Of Revenue [Line Items]
Contract liabilities	$ 56		$ 61
Contract liabilities, current	38		43
Revenue recognized, contract liabilities	26	$ 24
Contract with customer, cash payments received for liabilities that have been deferred	19	$ 20
Other Current Assets [Member]
Disaggregation Of Revenue [Line Items]
Contract assets	1		4
Other Current Liabilities [Member]
Disaggregation Of Revenue [Line Items]
Contract liabilities, current	39		43
Other Long-Term Liabilities [Member]
Disaggregation Of Revenue [Line Items]
Contract liabilities, non-current	$ 17		$ 18