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Note 9 - Commitments and Contingencies (Details Textual)
$ in Millions
3 Months Ended
May 31, 2016
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jun. 01, 2016
Environmental Litigation [Member]        
Number of Hazardous Waste Sites [Member]   15    
Accrual for Environmental Loss Contingencies, Ending Balance   $ 50 $ 55  
Dow Corning Corporation [Member] | Dow Corning Chapter 11 Related Matters [Member]        
Equity Method Investment, Ownership Percentage       50.00%
Indemnification of Excess Liability 50.00%      
Dow Corning Corporation [Member] | Dow Corning Breast Implant Litigation [Member]        
Indemnification of Excess Liability   50.00%    
Litigation Settlement, Expense   $ 1,800    
Loss Contingency Accrual, Ending Balance $ 290 $ 127 $ 130  
Dow Corning Corporation [Member] | Dow Corning Bankruptcy Pendency Interest Claims [Member]        
Loss Contingency Accrual, Ending Balance $ 107      
Dow Corning Corporation [Member] | Dow Corning Environmental Claims [Member]        
Indemnification of Excess Liability   50.00%