Earnings Per Common Share (Details) (USD $) In Millions, except Per Share data	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Net income attributable to Corning Incorporated - Basic	$ 755	$ 913	$ 1,503	$ 1,729
Net income attributable to Corning Incorporated - Diluted	$ 755	$ 913	$ 1,503	$ 1,729
Weighted-average shares - Basic	1,568	1,558	1,566	1,557
Effect of dilutive securities: Stock options and dilutive securities	23	23	24	23
Weighted-average shares - Diluted	1,591	1,581	1,590	1,580
Per share amount - Basic	$ 0.48	$ 0.59	$ 0.96	$ 1.11
Per share amount - Diluted	$ 0.47	$ 0.58	$ 0.95	$ 1.09
Stock Options [Member]
Stock options and other dilutive securities excluded from the calculation of diluted earnings per common share	26	42	48	46

The average number of shares issued and outstanding that are used in calculating Basic EPS, determined based on the timing of issuance of shares in the period, increased by the number of additional common shares that would have been outstanding if the dilutive potential common shares had been issued.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented.

+ References

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The amount of net income or loss for the period per each share of common stock outstanding during the reporting period.

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The amount of net income or loss for the period per each share of common stock and dilutive common stock equivalents outstanding during the reporting period.

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The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes.

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Net Income (Loss) Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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The sum of dilutive potential common shares used in the calculation of the diluted per-share computation.

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Number of [basic] shares, after adjustment for contingently issuable shares and other shares not deemed outstanding, determined by relating the portion of time within a reporting period that common shares have been outstanding to the total time in that period.

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