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		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Net income available to common stockholders - Numerator basic and diluted	$ 19	$ (88)	$ 77	$ (63)
Basic (in shares)	144.3	143.4	144.2	143.6
Employee compensation-related shares, including stock options (in shares)	0.4	0.0	0.3	0.0
Weighted-average common shares outstanding - Diluted (in shares)	144.7	143.4	144.5	143.6