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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net income (loss) available to common stockholders - Numerator basic and diluted	$ (174)	$ (68)	$ (116)	$ 30
Weighted-average common shares outstanding - Basic (in shares)	144.5	144.0	144.4	143.9
Employee compensation-related shares, including stock options (in shares)	0.0	0.0	0.0	0.9
Weighted-average common shares outstanding - Diluted (in shares)	144.5	144.0	144.4	144.8