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, 2020	Mar. 31, 2019
Net income available to common stockholders - Numerator basic and diluted	$ 38	$ 98
Weighted-average common shares outstanding - Basic (in shares)	144.2	143.9
Employee compensation-related shares, including stock options (in shares)	0.6	0.9
Weighted-average common shares outstanding - Diluted (in shares)	144.8	144.8