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Pensions and Other Postretirement Benefits | 6 Months Ended
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Jun. 30, 2017
Retirement Benefits [Abstract] |
Pensions and Other Postretirement Benefits | Pensions and Other Postretirement Benefits
| Three Months Ended June 30, 2017 |  | Three Months Ended June 30, 2016
| Pension Benefits |  | Global OPEB Plans |  | Pension Benefits |  | Global OPEB Plans
| U.S. |  | Non-U.S. |  |  | U.S. |  | Non-U.S. |
Service cost | $ | 79 |  |  | $ | 40 |  |  | $ | 6 |  |  | $ | 96 |  |  | $ | 59 |  |  | $ | 4 |
Interest cost | 536 |  |  | 126 |  |  | 49 |  |  | 553 |  |  | 126 |  |  | 50 |
Expected return on plan assets | (919 | ) |  | (172 | ) |  | — |  |  | (944 | ) |  | (177 | ) |  | — |
Amortization of prior service cost (credit) | (1 | ) |  | 1 |  |  | (4 | ) |  | (1 | ) |  | 3 |  |  | (3 | )
Amortization of net actuarial (gains) losses | (2 | ) |  | 48 |  |  | 8 |  |  | (7 | ) |  | 35 |  |  | 5 |
Net periodic pension and OPEB (income) expense | $ | (307 | ) |  | $ | 43 |  |  | $ | 59 |  |  | $ | (303 | ) |  | $ | 46 |  |  | $ | 56 |
| Six Months Ended June 30, 2017 |  | Six Months Ended June 30, 2016
| Pension Benefits |  | Global OPEB Plans |  | Pension Benefits |  | Global OPEB Plans
| U.S. |  | Non-U.S. |  |  | U.S. |  | Non-U.S. |
Service cost | $ | 158 |  |  | $ | 86 |  |  | $ | 10 |  |  | $ | 191 |  |  | $ | 115 |  |  | $ | 9 |
Interest cost | 1,072 |  |  | 251 |  |  | 98 |  |  | 1,106 |  |  | 257 |  |  | 100 |
Expected return on plan assets | (1,838 | ) |  | (343 | ) |  | — |  |  | (1,889 | ) |  | (359 | ) |  | — |
Amortization of prior service cost (credit) | (2 | ) |  | 2 |  |  | (7 | ) |  | (2 | ) |  | 6 |  |  | (7 | )
Amortization of net actuarial (gains) losses | (3 | ) |  | 95 |  |  | 16 |  |  | (13 | ) |  | 70 |  |  | 10 |
Net periodic pension and OPEB (income) expense | $ | (613 | ) |  | $ | 91 |  |  | $ | 117 |  |  | $ | (607 | ) |  | $ | 89 |  |  | $ | 112 |
We made discretionary contributions to our U.S. hourly pension plan of $2.0 billion in the six months ended June 30, 2016. These discretionary contributions were funded with the net proceeds from the issuance of senior unsecured notes.

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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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