Note 10 - Income Taxes (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Increase (Decrease) in Obligation, Pension Benefits	$ (16)	$ 10	$ 7
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax, Total	12	(8)	(5)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Total	4	2	2
Income Taxes Paid, Net, Total	149	70	$ 23
Unrecognized Tax Benefits, Ending Balance	16
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	1
Proceeds from Income Tax Refunds		$ 21
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total	10
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total	$ 424