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Note 12 - Employee Retirement Plans | 6 Months Ended
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Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract] |
Pension and Other Postretirement Benefits Disclosure [Text Block] | 12. 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 June 30, |  | Six months ended June 30, |  | Three months ended June 30, |  | Six months ended June 30,
| 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014
Service cost | $ | 22 |  | $ | 16 |  | $ | 45 |  | $ | 32 |  | $ | 4 |  | $ | 2 |  | $ | 7 |  | $ | 5
Interest cost |  | 37 |  |  | 38 |  |  | 73 |  |  | 76 |  |  | 8 |  |  | 9 |  |  | 16 |  |  | 18
Expected return on plan assets |  | (44) |  |  | (43) |  |  | (89) |  |  | (86) |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net loss |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  | 2 |  |  |
Amortization of prior service cost (credit) |  | 1 |  |  | 1 |  |  | 3 |  |  | 3 |  |  | (2) |  |  | (1) |  |  | (3) |  |  | (2)
Recognition of actuarial loss |  | 8 |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total pension and postretirement benefit expense | $ | 24 |  | $ | 12 |  | $ | 40 |  | $ | 25 |  | $ | 11 |  | $ | 10 |  | $ | 22 |  | $ | 21

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