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Document and Entity Information
Oct. 30, 2025
Document And Entity Information [Line Items]  
Entity Registrant Name PPG INDUSTRIES INC
Amendment Flag false
Entity Central Index Key 0000079879
Document Type 8-K
Document Period End Date Oct. 30, 2025
Entity Incorporation State Country Code PA
Entity File Number 001-1687
Entity Tax Identification Number 25-0730780
Entity Address, Address Line One One PPG Place
Entity Address, City or Town Pittsburgh
Entity Address, State or Province PA
Entity Address, Postal Zip Code 15272
City Area Code (412)
Local Phone Number 434-3131
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Common Stock, par value $1.66 2/3
Trading Symbol PPG
Security Exchange Name NYSE
A 0.875 Notesdue 2025 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 0.875% Notes due 2025
Trading Symbol PPG 25
Security Exchange Name NYSE
A 1.400 Notesdue 2027 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 1.400% Notes due 2027
Trading Symbol PPG 27
Security Exchange Name NYSE
A 2750 Notes Due 2029 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 2.750% Notes due 2029
Trading Symbol PPG 29A
Security Exchange Name NYSE
A 3.250 Notes Due 2032 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 3.250% Notes due 2032
Trading Symbol PPG 32
Security Exchange Name NYSE