Note 10 - Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statutory federal rate applied to income before income tax expense	$ 129	$ 35	$ 114
Current year permanent items	5	33	3
State and local taxes, net of federal tax benefit	26	10	27
Change in valuation allowance	0	0	1
Net operating loss carryback	0	0	(7)
Other items, net	(1)	0	(4)
Income tax expense as recorded	$ 159	$ 78	$ 134
Effective income tax rate	26.00%	46.00%	25.00%