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Retirement Plans | 9 Months Ended
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Sep. 30, 2017
Retirement Plans |
Retirement Plans | Note 3. Retirement Plans We provide defined benefit pension plans and other postretirement benefits to eligible employees. The components of net periodic benefit cost (credit) for these plans are as follows:
|  | Three Months Ended | Nine Months Ended
(In millions) |  | September 30, 2017 | October 1, 2016 | September 30, 2017 | October 1, 2016
Pension Benefits |  |  |  |  |  |  |  |  |
Service cost |  | $ | 25 | $ | 25 | $ | 75 | $ | 74
Interest cost |  |  | 81 |  | 84 |  | 242 |  | 254
Expected return on plan assets |  |  | (127) |  | (123) |  | (380) |  | (368)
Amortization of net actuarial loss |  |  | 34 |  | 26 |  | 102 |  | 78
Amortization of prior service cost |  |  | 4 |  | 4 |  | 12 |  | 11
Net periodic benefit cost |  | $ | 17 | $ | 16 | $ | 51 | $ | 49
Postretirement Benefits Other Than Pensions |  |  |  |  |  |  |  |  |
Service cost |  | $ | 1 | $ | 1 | $ | 2 | $ | 2
Interest cost |  |  | 3 |  | 4 |  | 9 |  | 12
Amortization of prior service credit |  |  | (2) |  | (6) |  | (6) |  | (17)
Net periodic benefit cost (credit) |  | $ | 2 | $ | (1) | $ | 5 | $ | (3)
In September 2017, we made a $300 million discretionary contribution to fund a U.S. pension plan.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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