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Pensions and Other Postretirement Benefits | 9 Months Ended
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Sep. 30, 2021
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, 2021 and 2020 were as follows:
| Pension
| Three Months Ended September 30 |  | Nine Months Ended September 30
($ in millions) | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $3 |  |  | $6 |  |  | $8 |  |  | $18 |
Interest cost | 17 |  |  | 22 |  |  | 49 |  |  | 65 |
Expected return on plan assets | (38) |  |  | (36) |  |  | (114) |  |  | (108) |
Amortization of actuarial losses | 10 |  |  | 17 |  |  | 30 |  |  | 53 |
Curtailments | — |  |  | — |  |  | — |  |  | 1 |
Net periodic benefit cost | ($8) |  |  | $9 |  |  | ($27) |  |  | $29 |
| Other Postretirement Benefits
| Three Months Ended September 30 |  | Nine Months Ended September 30
($ in millions) | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $3 |  |  | $2 |  |  | $9 |  |  | $7 |
Interest cost | 3 |  |  | 5 |  |  | 10 |  |  | 15 |
Amortization of actuarial losses | 5 |  |  | 4 |  |  | 15 |  |  | 12 |
Amortization of prior service credit | (14) |  |  | (14) |  |  | (41) |  |  | (44) |
Net periodic benefit cost | ($3) |  |  | ($3) |  |  | ($7) |  |  | ($10) |
PPG expects 2021 net periodic pension and other postretirement benefit cost to be income of approximately $45 million, with pension and other postretirement benefits representing income of approximately $35 million and $10 million, respectively. In 2020, PPG's U.S. and Canadian defined benefit plans were frozen for all participants. As of January 1, 2021, these plans are mostly inactive and, as such, the amortization period of the accumulated net actuarial losses is now the average remaining life expectancy of the plan participants. This change in amortization period reduces future pension expense for PPG. Contributions to Defined Benefit Pension Plans
| Three Months Ended September 30 |  | Nine Months Ended September 30
($ in millions) | 2021 |  | 2020 |  | 2021 |  | 2020
Non-U.S. defined benefit pension mandatory contributions | $1 |  |  | $2 |  |  | $3 |  |  | $7 |
PPG expects to make contributions to its defined benefit pension plans in the range of $5 million to $10 million during the remaining three months of 2021. PPG may make voluntary contributions to its defined benefit pension plans in 2021 and beyond.

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