Note 7 - Earnings Per Share - Reconciliation of the Numerators and Denominators of the Earnings Per Share Calculations (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Net income available to common stockholders - Numerator basic and diluted	$ 30	$ 8	$ 58	$ 25
Basic (in shares)	144.3	143.4	144.1	143.8
Employee compensation-related shares, including stock options (in shares)	0.1	0.3	0.2	0.8
Weighted-average common shares outstanding - Diluted (in shares)	144.4	143.7	144.3	144.6