Note 10 - Income Taxes (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Increase (Decrease) in Obligation, Pension Benefits	$ (20)	$ (16)	$ 10
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax, Total	15	12	(8)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Total	(5)	(4)	2
Income Taxes Paid, Net, Total	180	149	70
Unrecognized Tax Benefits, Ending Balance	15	15	14	$ 14
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	1	$ 1
Proceeds from Income Tax Refunds			$ 21
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	344
Operating Loss Carryforwards That Will Not Be Realized	$ 226