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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Note 3 - Investments (Details Textual) - USD ($) $ in Millions		3 Months Ended
	Sep. 09, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2021	Sep. 09, 2021	Dec. 31, 2020	Dec. 31, 2016
Debt, Current, Total				$ 55		$ 156
HSG [Member]
Gain (Loss) Related to Litigation Settlement, Total		$ (81)
Cash, Ending Balance	$ 75
Debt, Current, Total	175
Equity Method Investment, Summarized Financial Information, Pre-Tax Gain (Loss) on Settlements of Long-term Sales Agreements		200	$ 165
Inventory Write-down			$ 44
Equity Method Investment, Summarized Financial Information, Gains (Loss) on Settlements of Long-term Sales Agreements, Net		$ (19)
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
Business Acquisition, Preacquisition Contingency, Amount of Settlement, Periodic Payment	58
Gain (Loss) Related to Litigation Settlement, Total	(81)
Hemlock Semiconductor Operations LLC [Member]
Business Combination, Consideration Transferred, Total	352
Business Combination, Assets Arising from Contingencies, Amount Recognized	$ 20
Business Acquisition, Percentage of Voting Interests Acquired	80.50%
Hemlock Semiconductor Operations LLC [Member] \| HSG [Member]
Redeemable Noncontrolling Interest, Equity, Redemption Value, Total	$ 250
HS LLC [Member]
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
HSG [Member]
Business Combination, Consideration Transferred, Total	$ 250
Business Acquisition, Redemption Price					$ 250
Dow Corning Corporation [Member]
Equity Method Investment, Ownership Percentage							50.00%
Hemlock Semiconductor LLC [Member]
Equity Method Investment, Ownership Percentage							49.90%
Hemlock Semiconductor Operations LLC [Member]
Equity Method Investment, Ownership Percentage							40.25%