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Note 1 - Significant Accounting Policies (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Sep. 09, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Research and Development Expense, Total   $ 800 $ 1,000 $ 800
Foreign Currency Transaction Gain (Loss), Realized   126 (37) (19)
Interest Costs Capitalized   $ 36 $ 58 $ 54
HS LLC [Member]        
Business Acquisition, Percentage of Voting Interests Acquired 100.00%      
Hemlock Semiconductor Operations LLC [Member]        
Business Acquisition, Percentage of Voting Interests Acquired 80.50%      
DuPont de Nemours, Inc [Member] | HSG [Member]        
Noncontrolling Interest, Increase from Redemptions or Purchase of Interests $ 250      
Minimum [Member]        
Equity Method Investment, Ownership Percentage   20.00%    
Minimum [Member] | Building [Member]        
Property, Plant and Equipment, Useful Life (Year)   10 years    
Minimum [Member] | Equipment [Member]        
Property, Plant and Equipment, Useful Life (Year)   2 years    
Maximum [Member]        
Equity Method Investment, Ownership Percentage   50.00%    
Maximum [Member] | Building [Member]        
Property, Plant and Equipment, Useful Life (Year)   40 years    
Maximum [Member] | Equipment [Member]        
Property, Plant and Equipment, Useful Life (Year)   20 years