Note 15 - Income Taxes (Details Textual) - USD ($) $ in Millions	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2021
Income Tax Expense (Benefit), Total	$ 16			$ 5			$ 34	$ (27)
Effective Income Tax Rate Reconciliation, Percent, Total							(46.00%)	(28.00%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount					$ (30)
Goodwill, Impairment Loss			$ 51				$ 51
Other Tax Expense (Benefit)			(1)		(9)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount			37		48
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement				(2)	$ (258)			$ (260)
Tax Adjustments, Settlements, and Unusual Provisions						$ 6
Effective Income Tax Rate Reconciliation, Excluding Effects of Special Items, Percent							(45.00%)	28.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent							21.00%
BRAZIL
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount				$ (22)
Foreign Tax Authority [Member]
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount		$ 56	4
Domestic Tax Authority [Member]
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount			$ 2			$ (22)
Forecast [Member] | Foreign Tax Authority [Member] | Australian Taxation Office [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount									$ (25)