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Note 3 - HSG Transactions and Acquisitions (Details Textual)
$ in Millions
Sep. 09, 2020
USD ($)
HSG [Member]  
Redeemable Noncontrolling Interest, Equity, Redemption Value, Total $ 250
Equity Method Investment, Realized Gain (Loss) on Disposal, Total $ 498
HSG [Member] | Measurement Input, Discount Rate [Member]  
Equity Securities, FV-NI, Measurement Input 0.165
HSG [Member] | DuPont de Nemours, Inc [Member]  
Noncontrolling Interest, Increase from Redemptions or Purchase of Interests $ 250
Duponts Trichlorosilane [Member] | HSG [Member]  
Business Combination, Consideration Transferred, Total 255
Business Combination, Assets Arising from Contingencies, Amount Recognized 175
Business Acquisition, Preacquisition Contingency, Amount of Settlement 200
Gain (Loss) Related to Litigation Settlement $ 81
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%