Earnings Per Common Share (Schedule Of Reconciliation Of Amounts Used In Basic And Diluted Earnings Per Common Share) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Earnings Per Common Share [Abstract]
Net income attributable to Corning Incorporated, Basic earnings per common share	$ 1,728	$ 2,805	$ 3,558
Net income attributable to Corning Incorporated, Diluted earnings per common share	$ 1,728	$ 2,805	$ 3,558
Weighted-average shares, Basic earnings per common share	1,494	1,562	1,558
Effect of dilutive securities: Employee stock options and awards - Weighted-average shares	12	21	23
Weighted-average shares, Diluted earnings per common share	1,506	1,583	1,581
Per share amount, Basic earnings per common share	$ 1.16	$ 1.80	$ 2.28
Per share amount, Diluted earnings per common share	$ 1.15	$ 1.77	$ 2.25