Note 12 - Revenue (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Contract liabilities	$ 45		$ 48
Contract liabilities, current	31		34
Revenue recognized, contract liabilities	24	$ 25
Contract with customer, cash payments received for liabilities that have been deferred	20	$ 23
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	37		42
Other Long-Term Liabilities [Member]
Disaggregation Of Revenue [Line Items]
Contract liabilities, non-current	$ 8		$ 6