Note 4 - Revenue (Details Textual) - USD ($) $ in Millions	3 Months Ended					6 Months Ended
	Jun. 30, 2021		Jun. 30, 2020		Mar. 31, 2020	Jun. 30, 2021		Jun. 30, 2020		Dec. 31, 2020
Revenue, Cumulative Adjustments		[1]		[1]	$ 105		[1]	$ 105	[1]
Contract with Customer, Liability, Total	1,300					1,300				$ 1,400
Increase (Decrease) in Contract with Customer, Liability	28		$ 32			123		$ 73
Contract with Customer, Liability, Noncurrent	1,095					1,095				1,148
Contract with Customer, Liability, Current	228					228				211
Contract With Customer Liability, Deferred Revenue, Noncurrent	805					805				872
Contract With Customer Liability, Deferred Revenue, Current	159					159				152
HSG [Member]
Contract with Customer, Liability, Total	1,000					1,000				1,000
Contract With Customer Liability, Deferred Revenue, Noncurrent	805					805				872
Contract With Customer Liability, Deferred Revenue, Current	$ 159					$ 159				$ 152
Maximum [Member]
Long Term Supply, Commitment Period (Year)						10 years

[1] Amount represents the negative impact of a cumulative adjustment to reduce revenue by $105 million recorded during the first quarter of 2020. The adjustment was associated with a previously recorded commercial benefit asset, reflected as a prepayment, to a customer with a long-term supply agreement that substantially exited its production of LCD panels.