Note 13 - Financial Instruments (Details Textual) - USD ($) shares in Millions, $ in Millions			12 Months Ended
	Feb. 26, 2021	Aug. 03, 2020	Dec. 31, 2021	Dec. 31, 2020
Embedded conversion features and term extension option expense		$ 407
Remaining embedded conversion features and term extension option net expense		$ 9
Fair Value, Inputs, Level 2 [Member]
Long-term Debt, Fair Value			$ 269	$ 17
Forward Contracts [Member]
Gross fair value of foreign currency in an asset position			0	1
Gross fair value of foreign currency in a liability position			0	0
Series A Preferred Stock
Stock repurchased	1
Preferred stock, number of shares exchanged	1
Series A Preferred Stock | Other Charges (income) Net [Member]
Net expense	$ 2
Series B Preferred Stock [Member]
Preferred stock, number of shares exchanged	1
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Derivative Asset, Notional Amount			322	361
Designated as Hedging Instrument [Member]
Derivatives Hedging Instruments			$ 0	$ 0