Note 4 - HSG Transactions and Acquisitions (Details Textual) $ in Millions	Sep. 09, 2020 USD ($)
HSG [Member]
Contract With Customer Liability, Deferred Revenue	$ 1,070
HSG [Member] | Developed Technologies [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total	$ 215
Finite-Lived Intangible Asset, Useful Life (Year)	20 years
HSG [Member] | Other Intangible Assets [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total	$ 70
Finite-Lived Intangible Asset, Useful Life (Year)	15 years
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
HS LLC [Member]
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Hemlock Semiconductor Operations LLC [Member]
Business Combination, Consideration Transferred, Total	$ 352
Business Acquisition, Percentage of Voting Interests Acquired	80.50%
Business Combination, Assets Arising from Contingencies, Amount Recognized	$ 20
Equity Method Investments	250
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value	102
Hemlock Semiconductor Operations LLC [Member] | HSG [Member]
Redeemable Noncontrolling Interest, Equity, Redemption Value, Total	250
HSG [Member]
Business Combination, Consideration Transferred, Total	250
Equity Method Investment, Realized Gain (Loss) on Disposal, Total	498
Equity Method Investments	250	[1]
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value	102	[1]
Contract With Customer Liability, Customer Deposit	264
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total	285
Business Acquisition, Transaction Costs	$ 12
HSG [Member] | Minimum [Member]
Customer Deposits, Measurement Input	0.0254
HSG [Member] | Maximum [Member]
Customer Deposits, Measurement Input	0.0323

[1] The purchase price used to measure the goodwill of the Redemption is $352 million, including the fair value of Corning’s previously held equity interest and non-controlling interest, in the amount of $250 million and $102 million, respectively.