Note 10 - Income Taxes - Federal and State Income Tax Expense (Benefit) Summary (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Federal	$ 73	$ 148	$ 74
State and local	12	31	26
Current income tax expense	85	179	100
Federal	(76)	(21)	(12)
State and local	(15)	1	(10)
Deferred income tax benefit	(91)	(20)	(22)
Income tax (benefit) expense as recorded	$ (6)	$ 159	$ 78