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Note 11 - Employee Retirement Plans | 9 Months Ended
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Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract] |
Pension and Other Postretirement Benefits Disclosure [Text Block] | 11. Employee Retirement Plans The following table summarizes the components of net periodic benefit cost for Corning’s defined benefit pension and postretirement health care and life insurance plans (in millions):
| Pension benefits |  | Postretirement benefits
| Three months ended September 30, |  | Nine months ended September 30, |  | Three months ended September 30, |  | Nine months ended September 30,
| 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014
Service cost | $ | 22 |  | $ | 30 |  | $ | 67 |  | $ | 62 |  | $ | 3 |  | $ | 4 |  | $ | 10 |  | $ | 9
Interest cost |  | 36 |  |  | 42 |  |  | 109 |  |  | 118 |  |  | 8 |  |  | 10 |  |  | 24 |  |  | 28
Expected return on plan assets |  | (44) |  |  | (45) |  |  | (133) |  |  | (131) |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net loss |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  | 3 |  |  |
Amortization of prior service cost (credit) |  | 2 |  |  | 1 |  |  | 5 |  |  | 4 |  |  | (2) |  |  | (3) |  |  | (5) |  |  | (5)
Recognition of actuarial loss |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total pension and postretirement benefit expense | $ | 16 |  | $ | 28 |  | $ | 56 |  | $ | 53 |  | $ | 10 |  | $ | 11 |  | $ | 32 |  | $ | 32

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