Note 15 - Other Charges (Income), Net (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Other Income And Expenses [Abstract]
Change in fair value of embedded conversion features derivative liability	[1]	$ 4	$ (3)	$ (49)	$ (2)
Loss on foreign exchange transactions		3	1	5	1
Loss on early retirement of debt			1		1
Other		1	$ 1	(1)	1
Total		$ 8		$ (45)	$ 1

[1] Refer to Note 24, “Financial Instruments”.