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Pension Benefits | 3 Months Ended
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Mar. 31, 2018
Retirement Benefits [Abstract] |
Pension Benefits | Pension Benefits We sponsor qualified and supplemental (non-qualified) noncontributory defined benefit pension plans covering certain full-time salaried and hourly U.S. employees. The most significant of these plans, the YUM Retirement Plan (the "Plan"), is funded. We fund our other U.S. plans as benefits are paid. The Plan and our most significant non-qualified plan in the U.S. are closed to new salaried participants. The components of net periodic benefit cost associated with our significant U.S. pension plans are as follows:
| Quarter ended
| 2018 |  | 2017
Service cost | $ | 2 |  |  | $ | 3 |
Interest cost | 9 |  |  | 10 |
Expected return on plan assets | (10 | ) |  | (12 | )
Amortization of net loss | 4 |  |  | 2 |
Amortization of prior service cost | 1 |  |  | 1 |
Net periodic benefit cost | $ | 6 |  |  | $ | 4 |
Additional loss recognized due to settlements(a) | $ | 1 |  |  | $ | 5 |
Pension data adjustment(b) | $ | — |  |  | $ | 22 |
(a) | Losses are a result of settlement transactions which exceeded the sum of annual service and interest costs for the applicable plan. These losses were recorded in Other pension (income) expense.
(b) Reflects a non-cash, out-of-year charge related to the adjustment of certain historical deferred vested liability balances in the Plan during the first quarter of 2017 recorded in Other pension (income) expense. See Note 5.

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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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