Note 8 - Stockholders' Equity - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Net (loss) income	$ (11)	$ 4	$ (3)	$ 3	$ (281)	$ 9	$ (10)	$ (269)
Less: Dividends on Series A Preferred Stock	6			6			18	18
Net loss attributable to common stockholders	$ (17)			$ (3)			$ (28)	$ (287)
Weighted average basic shares outstanding (in shares)	82.7			82.1			82.5	81.9
Effect of dilutive securities (in shares)	0.0			0.0			0.0	0.0
Weighted average diluted shares outstanding (in shares)	82.7			82.1			82.5	81.9
Basic (in dollars per share)	$ (0.21)			$ (0.04)			$ (0.34)	$ (3.50)
Diluted (in dollars per share)	$ (0.21)			$ (0.04)			$ (0.34)	$ (3.50)