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		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net income available to common stockholders - Numerator basic and diluted	$ 8	$ 53	$ 25	$ 124
Weighted-average common shares outstanding - Basic (in shares)	143.4	145.2	143.8	145.1
Employee compensation-related shares, including stock options (in shares)	0.3	1.5	0.8	1.4
Weighted-average common shares outstanding - Diluted (in shares)	143.7	146.7	144.6	146.5