Note 4 - Debt	6 Months Ended
Note 4 - Debt	Jun. 30, 2014
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	4. Debt Based on borrowing rates currently available to us for loans with similar terms and maturities, the fair value of long-term debt was $3.6 billion at June 30, 2014 and $3.5 billion at December 31, 2013, compared to recorded book values of $3.2 billion at June 30, 2014 and $3.3 billion at December 31, 2013. The Company measures the fair value of its long-term debt using Level 2 inputs based primarily on current market yields for its existing debt traded in the secondary market. 2014 At June 30, 2014, Corning had $416 million in outstanding commercial paper as part of the Company’s commercial paper program established in the second quarter of 2013. The estimated fair value of this commercial paper approximates its carrying value due to the short-term maturities. 2013 In the second quarter of 2013, the Company established a commercial paper program on a private placement basis, pursuant to which we may issue short-term, unsecured commercial paper notes up to a maximum aggregate principal amount outstanding at any time of $1 billion. Under this program, the Company may issue the notes from time to time and will use the proceeds for general corporate purposes. The maturities of the notes will vary, but may not exceed 390 days from the date of issue. The interest rates will vary based on market conditions and the ratings assigned to the notes by credit rating agencies at the time of issuance. The Company’s $1 billion revolving credit facility is available to support obligations under the commercial paper program, if needed. In the first quarter of 2013, we amended and restated our existing revolving credit facility. The amended facility provides a $1 billion unsecured multi-currency line of credit that expires in March 2018. The facility includes a leverage test (debt to capital ratio) financial covenant. As of June 30, 2014, we were in compliance with this covenant. In the first quarter of 2013, Corning repaid the aggregate principal amount and accrued interest outstanding on the credit facility entered into in the second quarter of 2011 that allowed Corning to borrow up to Chinese Renminbi (RMB) 4.0 billion. The total amount repaid was approximately $500 million. Upon repayment, this facility was terminated.

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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