Commitments, Contingencies and Guarantees (Narrative) (Details) $ in Millions			1 Months Ended		12 Months Ended
		May 31, 2016 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($)	Dec. 31, 2016 USD ($)	Jun. 01, 2016
Loss Contingency, Accrual, Current					$ 57	$ 113
Loss Contingency, Accrual, Noncurrent					$ 196	279
Pittsburgh Corning Corporation PCC [Member]
Equity Method Investment, Ownership Percentage					50.00%
Pittsburgh Corning Corporation PCC [Member] | Asbestos Litigation [Member]
Payment of claims			$ 50	$ 35
Loss Contingency, Accrual					$ 135
Loss Contingency, Accrual, Current					35
Loss Contingency, Accrual, Noncurrent					100
Dow Corning Corporation [Member]
Equity Method Investment, Ownership Percentage							50.00%	50.00%
Indemnification of excess liability		50.00%
Dow Corning Corporation [Member] | Dow Corning Breast Implant Litigation [Member]
Payment of claims					1,800
Loss Contingency, Accrual		$ 290			$ 165
Indemnification of excess liability					50.00%
Dow Corning Corporation [Member] | Dow Corning Bankruptcy Pendency Interest Claims [Member]
Loss Contingency, Accrual		$ 107
Dow Corning Corporation [Member] | Dow Corning Environmental Claims [Member]
Indemnification of excess liability					50.00%
Environmental Cleanup and Related Litigation [Member]
Number of Hazardous Waste Sites | item					15
Accrual for Environmental Loss Contingencies					$ 41	30
Amended Pittsburgh Corning Corporation Plan [Member] | Asbestos Litigation [Member]
Loss Contingency, Accrual							$ 290
Non-PCC Asbestos Litigation [Member] | Asbestos Litigation [Member]
Loss Contingency, Accrual					$ 98	$ 146
Minimum [Member]
Equity Method Investment, Ownership Percentage	[1],[2]				20.00%
Maximum [Member]
Equity Method Investment, Ownership Percentage	[1],[2]				50.00%

[1] Amounts reflect Corning’s direct ownership interest in the affiliated companies at December 31, 2019 and 2018. Corning does not control these entities.

[2] Hemlock Semiconductor LLC and Hemlock Semiconductor Operations LLC, of which Corning has 49.9% and 40.25% ownership, respectively, are recorded as equity method investments and are affiliated companies of HSG. At December 31, 2019, the negative carrying value of Corning’s investment in HSG was $270 million and recorded in Other Liabilities. At December 31, 2018, the carrying value of the investment in HSG was $42 million and recorded in Investments.