Note 8 - 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
	Mar. 31, 2022	Mar. 31, 2021
Net income available to common stockholders - Numerator basic and diluted	$ 17	$ 71
Weighted-average common shares outstanding - Basic (in shares)	144.2	144.9
Employee compensation-related shares, including stock options (in shares)	1.1	1.5
Weighted-average common shares outstanding - Diluted (in shares)	145.3	146.4