Debt	3 Months Ended
Mar. 31, 2018
Debt [Abstract]
Debt	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 $5.1 billion at March 31, 2018 and December 31, 2017, compared to recorded book values of $4.8 billion at March 31, 2018 and $4.7 billion at December 31, 2017. 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. Corning did not have outstanding commercial paper at March 31, 2018 and December 31, 2017.

Debt

3 Months Ended

Mar. 31, 2018

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 $5.1 billion at March 31, 2018 and December 31, 2017, compared to recorded book values of $4.8 billion at March 31, 2018 and $4.7 billion at December 31, 2017. 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.

Corning did not have outstanding commercial paper at March 31, 2018 and December 31, 2017.