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Investments (Equity Method Investments) (Details) (USD $)
In Millions, unless otherwise specified

6 Months Ended

Jun. 30, 2011

Dec. 31, 2010

Schedule of Investments [Line Items]

Equity method investments

$ 5,026

$ 4,369

Other investments

3

3

5,029

4,372

Samsung Corning Precision Materials Co., Ltd. [Member]

Schedule of Investments [Line Items]

Ownership interest percentage, maximum

50.00%

^[1]

Equity method investments

3,519

2,943

Dow Corning Corporation [Member]

Schedule of Investments [Line Items]

Ownership interest percentage, maximum

50.00%

^[1]

Equity method investments

1,243

1,186

All Other [Member]

Schedule of Investments [Line Items]

Ownership interest percentage, maximum

50.00%

Ownership interest percentage, minimum

20.00%

^[1]

Equity method investments

$ 264

$ 240

[1]	Amounts reflect Corning's direct ownership interests in the respective affiliated companies. Corning does not control any of these entities

This element represents the aggregate carrying amount of all cost-method investments held by the Company. Generally, such investments do not have readily determinable fair values and are not required to be accounted for by the equity method. The carrying amount of such securities equates to cost, adjusted for other-than-temporary impairment. The cost method and lower-of-cost or market, an adaptation of the cost method, is generally followed for most investments in noncontrolled corporations, in some corporate joint ventures, and to a lesser extent in unconsolidated subsidiaries, particularly foreign.

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