Note 12 - Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income tax expense (benefit)	$ 3	$ 42	$ (3)	$ 101
Effective income tax rate	(8.00%)	28.00%	4.00%	27.00%