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Pensions and Other Postretirement Benefits | 9 Months Ended
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Sep. 30, 2020
Retirement Benefits [Abstract] |
Pensions and Other Postretirement Benefits | Pensions and Other Postretirement Benefits Service cost for net periodic pension and other postretirement benefit costs is included in Cost of sales, exclusive of depreciation and amortization, Selling, general and administrative, and Research and development, net in the accompanying condensed consolidated statements of income. All other components of net periodic benefit cost are recorded in Other charges in the accompanying condensed consolidated statements of income. The net periodic pension and other postretirement benefit costs for the three and nine months ended September 30, 2020 and 2019 were as follows:
| Pension |  |  |  |  |  |
| Three Months Ended September 30 |  |  |  | Nine Months Ended September 30 |  |
($ in millions) | 2020 |  | 2019 |  | 2020 |  | 2019
Service cost | $6 |  |  | $6 |  |  | $18 |  |  | $17 |
Interest cost | 22 |  |  | 26 |  |  | 65 |  |  | 79 |
Expected return on plan assets | (36) |  |  | (35) |  |  | (108) |  |  | (105) |
Amortization of actuarial losses | 17 |  |  | 16 |  |  | 53 |  |  | 47 |
Curtailments | — |  |  | — |  |  | 1 |  |  | — |
Net periodic benefit cost | $9 |  |  | $13 |  |  | $29 |  |  | $38 |
| Other Postretirement Benefits |  |  |  |  |  |
| Three Months Ended September 30 |  |  |  | Nine Months Ended September 30 |  |
($ in millions) | 2020 |  | 2019 |  | 2020 |  | 2019
Service cost | $2 |  |  | $3 |  |  | $7 |  |  | $7 |
Interest cost | 5 |  |  | 6 |  |  | 15 |  |  | 19 |
Amortization of actuarial losses | 4 |  |  | 2 |  |  | 12 |  |  | 6 |
Amortization of prior service credit | (14) |  |  | (14) |  |  | (44) |  |  | (43) |
Net periodic benefit cost | ($3) |  |  | ($3) |  |  | ($10) |  |  | ($11) |
PPG expects its 2020 net periodic pension and other postretirement benefit cost will be approximately $25 million, with pension expense representing approximately $40 million and other postretirement benefit cost representing a benefit of approximately $15 million. Contributions to Defined Benefit Pension Plans
| Three Months Ended September 30 |  |  |  | Nine Months Ended September 30 |  |
($ in millions) | 2020 |  | 2019 |  | 2020 |  | 2019
Non-U.S. defined benefit pension mandatory contributions | $2 |  |  | $2 |  |  | $7 |  |  | $8 |
PPG expects to make mandatory contributions to its non-U.S. pension plans in the range of $5 million to $10 million during the remaining three months of 2020. PPG may make voluntary contributions to its defined benefit pension plans in 2020 and beyond.

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