Note 12 - Other Charges (Income), Net (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other Income And Expenses [Abstract]
Loss on foreign exchange transactions		$ 1	$ 3	$ 1	$ 5
Change in fair value of embedded conversion features derivative liability	[1]	(1)	4		(49)
Other		1	1		(1)
Total		$ 1	$ 8	$ 1	$ (45)

[1] Refer to Note 20, “Financial Instruments”.