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Pensions and Other Postretirement Benefits | 3 Months Ended
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Mar. 31, 2018
Retirement Benefits [Abstract] |
Pensions and Other Postretirement Benefits | Pensions and Other Postretirement Benefits
| Three Months Ended March 31, 2018 |  | Three Months Ended March 31, 2017
| Pension Benefits |  | Global OPEB Plans |  | Pension Benefits |  | Global OPEB Plans
| U.S. |  | Non-U.S. |  |  | U.S. |  | Non-U.S. |
Service cost | $ | 83 |  |  | $ | 66 |  |  | $ | 5 |  |  | $ | 79 |  |  | $ | 46 |  |  | $ | 4 |
Interest cost | 513 |  |  | 120 |  |  | 50 |  |  | 536 |  |  | 125 |  |  | 49 |
Expected return on plan assets | (973 | ) |  | (212 | ) |  | — |  |  | (919 | ) |  | (171 | ) |  | — |
Amortization of prior service cost (credit) | (1 | ) |  | 1 |  |  | (4 | ) |  | (1 | ) |  | 1 |  |  | (3 | )
Amortization of net actuarial (gains) losses | 2 |  |  | 37 |  |  | 13 |  |  | (1 | ) |  | 47 |  |  | 8 |
Net periodic pension and OPEB (income) expense | $ | (376 | ) |  | $ | 12 |  |  | $ | 64 |  |  | $ | (306 | ) |  | $ | 48 |  |  | $ | 58 |
The non-service cost components of the net periodic pension and OPEB income of $421 million and $329 million in the three months ended March 31, 2018 and 2017 are presented in Interest income and other non-operating income, net. We elected to use the 2017 amounts disclosed above as the practical expedient for determining the retrospective presentation. Refer to Note 1 for additional details on the adoption of ASU 2017-07. We expect to contribute approximately $1.2 billion to our non-U.S. pension plans in 2018, inclusive of the Korea payment of pension obligations for separated employees. Refer to Note 16 for additional information.

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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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