Investments (Related Party Information For Investments In Affiliates) (Details) (Affiliated Companies [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Affiliated Companies [Member]
Schedule of Investments [Line Items]
Corning sales to affiliated companies	$ 6	$ 6	$ 13	$ 12
Corning purchases from affiliated companies	50	19	68	56
Corning transfers of assets, at cost, to affiliated companies	25	27	40	61
Dividends received from affiliated companies	3	69	521	389
Royalty income from affiliated companies	22	66	44	127
Corning services to affiliates	$ 6	$ 13	$ 16	$ 21

Costs associated with revenues arising from an entity that is an affiliate of the reporting entity by means of direct or indirect ownership.

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This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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