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Pensions and Other Postretirement Benefits | 3 Months Ended
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Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract] |
Pensions and Other Postretirement Benefits | Pensions and Other Postretirement Benefits
| Three Months Ended March 31, 2017 |  | Three Months Ended March 31, 2016
| Pension Benefits |  | Global OPEB Plans |  | Pension Benefits |  | Global OPEB Plans
| U.S. |  | Non-U.S. |  |  | U.S. |  | Non-U.S. |
Service cost | $ | 79 |  |  | $ | 95 |  |  | $ | 4 |  |  | $ | 95 |  |  | $ | 85 |  |  | $ | 5 |
Interest cost | 536 |  |  | 127 |  |  | 49 |  |  | 553 |  |  | 144 |  |  | 50 |
Expected return on plan assets | (919 | ) |  | (183 | ) |  | — |  |  | (945 | ) |  | (182 | ) |  | — |
Amortization of prior service cost (credit) | (1 | ) |  | 1 |  |  | (3 | ) |  | (1 | ) |  | 3 |  |  | (4 | )
Amortization of net actuarial (gains) losses | (1 | ) |  | 62 |  |  | 8 |  |  | (6 | ) |  | 47 |  |  | 5 |
Net periodic pension and OPEB (income) expense | $ | (306 | ) |  | $ | 102 |  |  | $ | 58 |  |  | $ | (304 | ) |  | $ | 97 |  |  | $ | 56 |
We made discretionary contributions to our U.S. hourly pension plan of $1.5 billion in the three months ended March 31, 2016 and $482 million in April 2016. These discretionary contributions were funded with the net proceeds from the issuance of senior unsecured notes.

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