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Pensions and Other Postretirement Benefits
 3 Months Ended
Mar. 31, 2025
Retirement Benefits [Abstract]  
Pensions and Other Postretirement Benefits Pensions and Other Postretirement Benefits
The service cost component of net periodic pension and other postretirement benefit cost 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 statement of income. All other components of net periodic benefit cost are recorded in Other (income)/charges, net in the accompanying condensed consolidated statement of income.
Net periodic pension benefit cost and other postretirement benefit cost for the three months ended March 31, 2025 and 2024 was as follows:
 PensionOther Postretirement Benefits
 Three Months Ended
March 31		Three Months Ended
March 31
($ in millions)2025202420252024
Service cost$2 $2 $1 $1 
Interest cost25 26 5 6 
Expected return on plan assets(26)(27)— — 
Amortization of actuarial losses6 6 — — 
Amortization of prior service credit— — (1)(2)
Settlement1 — — — 
Net periodic benefit cost$8 $7 $5 $5 
PPG expects 2025 full year net periodic pension expense of approximately $35 million and net periodic other postretirement expense of approximately $20 million.
Contributions to Defined Benefit Pension Plans
Three Months Ended
March 31
($ in millions)20252024
Non-U.S. defined benefit pension contributions$— $1 
PPG expects to make required mandatory contributions to its defined benefit pension plans in the range of $20 million to $30 million during the remaining nine months of 2025. In addition to any mandatory contributions, PPG may elect to make voluntary contributions to its defined benefit pension plans in 2025 and beyond.