Earnings Per Common Share (Schedule Of Reconciliation Of Amounts Used In Basic And Diluted Earnings Per Common Share) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Earnings Per Common Share [Abstract]
Net income attributable to Corning Incorporated, Basic earnings per common share	$ 462	$ 755	$ 924	$ 1,503
Net income attributable to Corning Incorporated, Diluted earnings per common share	$ 462	$ 755	$ 924	$ 1,503
Weighted-average shares, Basic earnings per common share	1,506	1,568	1,511	1,566
Effect of dilutive securities: Employee stock options and awards - Weighted-average shares	12	23	13	24
Weighted-average shares, Diluted earnings per common share	1,518	1,591	1,524	1,590
Per share amount, Basic earnings per common share	$ 0.31	$ 0.48	$ 0.61	$ 0.96
Per share amount, Diluted earnings per common share	$ 0.30	$ 0.47	$ 0.61	$ 0.95