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Pensions and Other Postretirement Benefits
 3 Months Ended
Mar. 31, 2022
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.
Net periodic pension and other postretirement benefit (income)/cost for the three months ended March 31, 2022 and 2021 was as follows:
 PensionOther Postretirement Benefits
 Three Months Ended
March 31		Three Months Ended
March 31
($ in millions)2022202120222021
Service cost$2 $3 $3 $3 
Interest cost19 16 4 3 
Expected return on plan assets(36)(38)— — 
Amortization of actuarial losses8 10 4 6 
Amortization of prior service credit— — (3)(14)
Net periodic benefit (income)/cost($7)($9)$8 ($2)
Net periodic other postretirement expense was higher for the three months ended March 31, 2022 compared to
2021 due to a decrease in the benefit associated with a 2017 other postretirement benefit plan design change. The 2017 plan design change resulted in a significant reduction in the Company’s postretirement benefit obligation, the impact of which was amortized as a reduction of net periodic benefit cost through 2021.
PPG expects 2022 full year net periodic pension income of approximately $25 million and net periodic other postretirement expense of approximately $30 million.
Contributions to Defined Benefit Pension Plans
Three Months Ended
March 31
($ in millions)20222021
Non-U.S. defined benefit pension mandatory contributions$1 $1 
PPG expects to make contributions to its defined benefit pension plans in the range of $10 million to $15 million during the remaining nine months of 2022. PPG may make voluntary contributions to its defined benefit pension plans in 2022 and beyond.