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Income Taxes
 3 Months Ended
Mar. 31, 2025
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
Three Months Ended
March 31
20252024
Effective tax rate on pretax income24.3 %23.6 %
Income tax expense for the three months ended March 31, 2025 and 2024 is based on an estimated annual effective rate, which requires management to make its best estimate of annual pretax income or loss. During the year, PPG management regularly updates forecasted annual pretax results for the various countries in which PPG operates based on changes in factors such as prices, shipments, product mix, raw material inflation and manufacturing operations. To the extent that actual 2025 pretax results for U.S. and foreign income or loss vary from estimates, the actual Income tax expense recognized in 2025 could be different from the forecasted amount used to estimate Income tax expense for the three months ended March 31, 2025.