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Note 11 - Commitments and Contingencies (Details Textual)
$ in Millions
3 Months Ended
May 31, 2016
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 30, 2016
Jun. 01, 2016
Environmental Cleanup and Related Litigation [Member]          
Number of Hazardous Waste Sites [Member]   15      
Accrual for Environmental Loss Contingencies, Ending Balance   $ 64 $ 68    
Dow Corning Corporation [Member]          
Equity Method Investment, Ownership Percentage       50.00% 50.00%
Indemnification of Excess Liability 50.00%        
Asbestos Litigation [Member]          
Loss Contingency Accrual, Ending Balance   96 96    
Dow Corning Breast Implant Litigation [Member] | Dow Corning Corporation [Member]          
Loss Contingency Accrual, Ending Balance $ 290 $ 160 $ 160    
Indemnification of Excess Liability   50.00%      
Litigation Settlement, Expense   $ 1,800      
Dow Corning Bankruptcy Pendency Interest Claims [Member] | Dow Corning Corporation [Member]          
Loss Contingency Accrual, Ending Balance $ 107        
Dow Corning Environmental Claims [Member] | Dow Corning Corporation [Member]          
Indemnification of Excess Liability   50.00%