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Pensions and Other Postretirement Benefits
 6 Months Ended
Jun. 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 six months ended June 30, 2020 and 2019 were as follows:
 Pension
 Three Months Ended
June 30		Six Months Ended
June 30
($ in millions)2020201920202019
Service cost$6  $5  $12  $11  
Interest cost21  27  43  53  
Expected return on plan assets(36) (35) (72) (70) 
Amortization of actuarial losses18  16  36  31  
Curtailments1  —  1  —  
Net periodic benefit cost$10  $13  $20  $25  
 Other Postretirement Benefits
 Three Months Ended
June 30		Six Months Ended
June 30
($ in millions)2020201920202019
Service cost$3  $2  $5  $4  
Interest cost5  7  10  13  
Amortization of actuarial losses4  2  8  4  
Amortization of prior service credit(15) (15) (30) (29) 
Net periodic benefit cost($3) ($4) ($7) ($8) 
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 $15 million.
Contributions to Defined Benefit Pension Plans
Three Months Ended
June 30		Six Months Ended
June 30
($ in millions)2020201920202019
Non-U.S. defined benefit pension mandatory contributions$3  $3  $5  $6  
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 six months of 2020. PPG may make voluntary contributions to its defined benefit pension plans in 2020 and beyond.