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Pension Benefits | 9 Months Ended
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Sep. 30, 2018
Retirement Benefits [Abstract] |
Pension Benefits | PENSION BENEFITS Certain of Aptiv’s non-U.S. subsidiaries sponsor defined benefit pension plans, which generally provide benefits based on negotiated amounts for each year of service. Aptiv’s primary non-U.S. plans are located in France, Germany, Mexico, Portugal and the United Kingdom (“U.K.”). The U.K. and certain Mexican plans are funded. In addition, Aptiv has defined benefit plans in South Korea, Turkey and Italy for which amounts are payable to employees immediately upon separation. The obligations for these plans are recorded over the requisite service period. Aptiv sponsors a Supplemental Executive Retirement Program (“SERP”) for those employees who were U.S. executives of DPHH prior to September 30, 2008 and were still U.S. executives of the Company on October 7, 2009, the effective date of the program. This program is unfunded. Executives receive benefits over 5 years after an involuntary or voluntary separation from Aptiv. The SERP is closed to new members. The amounts shown below reflect the defined benefit pension expense for the three and nine months ended September 30, 2018 and 2017:
| Non-U.S. Plans |  | U.S. Plans
| Three Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (in millions)
Service cost | $ | 4 |  |  | $ | 5 |  |  | $ | — |  |  | $ | — |
Interest cost | 7 |  |  | 9 |  |  | — |  |  | — |
Expected return on plan assets | (6 | ) |  | (8 | ) |  | — |  |  | — |
Curtailment loss | — |  |  | 1 |  |  | — |  |  | — |
Amortization of actuarial losses | 4 |  |  | 5 |  |  | — |  |  | — |
Net periodic benefit cost | $ | 9 |  |  | $ | 12 |  |  | $ | — |  |  | $ | — |
| Non-U.S. Plans |  | U.S. Plans
| Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (in millions)
Service cost | $ | 13 |  |  | $ | 15 |  |  | $ | — |  |  | $ | — |
Interest cost | 21 |  |  | 21 |  |  | — |  |  | 1 |
Expected return on plan assets | (19 | ) |  | (20 | ) |  | — |  |  | — |
Curtailment loss | 1 |  |  | 4 |  |  | — |  |  | — |
Amortization of actuarial losses | 11 |  |  | 10 |  |  | 1 |  |  | — |
Net periodic benefit cost | $ | 27 |  |  | $ | 30 |  |  | $ | 1 |  |  | $ | 1 |
Other postretirement benefit obligations were approximately $4 million and $4 million at September 30, 2018 and December 31, 2017, respectively.

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