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Note 11 - Employee Retirement Plans | 6 Months Ended
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Jun. 30, 2016
Notes to Financial Statements |
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 June 30, |  | Six months ended June 30, |  | Three months ended June 30, |  | Six months ended June 30,
| 2016 |  | 2015 |  | 2016 |  | 2015 |  | 2016 |  | 2015 |  | 2016 |  | 2015
Service cost | $ | 21 |  | $ | 22 |  | $ | 43 |  | $ | 45 |  | $ | 2 |  | $ | 4 |  | $ | 4 |  | $ | 7
Interest cost |  | 31 |  |  | 37 |  |  | 62 |  |  | 73 |  |  | 6 |  |  | 8 |  |  | 13 |  |  | 16
Expected return on plan assets |  | (41) |  |  | (44) |  |  | (83) |  |  | (89) |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  | 2
Amortization of prior service cost (credit) |  | 2 |  |  | 1 |  |  | 3 |  |  | 3 |  |  | (1) |  |  | (2) |  |  | (2) |  |  | (3)
Recognition of actuarial loss |  | 28 |  |  | 8 |  |  | 35 |  |  | 8 |  |  |  |  |  |  |  |  |  |  |  |
Total pension and postretirement benefit expense | $ | 41 |  | $ | 24 |  | $ | 60 |  | $ | 40 |  | $ | 7 |  | $ | 11 |  | $ | 15 |  | $ | 22

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