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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net income (loss) available to common stockholders - Numerator basic and diluted	$ 48	$ 45	$ 172	$ (71)
Weighted-average common shares outstanding - Basic (in shares)	144.8	144.5	145.0	144.4
Employee compensation-related shares, including stock options (in shares)	1.4	0.7	1.4	0.0
Weighted-average common shares outstanding - Diluted (in shares)	146.2	145.2	146.4	144.4