HSG Transactions and Acquisitions (Net Gain on Previously Owned Equity) (Details) - USD ($) $ in Millions		12 Months Ended
Sep. 09, 2020	Dec. 31, 2018
Business Acquisition [Line Items]
Fair value of previously held equity investment		$ 841
HSG [Member]
Business Acquisition [Line Items]
Fair value of previously held equity investment	$ 250
Equity investment liability balance as of acquisition date	(248)
Corning's gain on previously held equity investment	$ 498

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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