Note 12 - Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income tax expense	$ 35	$ 43	$ 65	$ 67
Effective income tax rate	194.00%	26.00%	52.00%	26.00%

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration