Supplier Finance Programs (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Supplier Finance Program, Obligation [Roll Forward]
Supplier finance obligation, beginning of period	$ 251	$ 286
Invoices confirmed	598
Confirmed invoices paid	(673)
Currency impact	40
Supplier finance obligation, end of period	$ 251
Supplier Finance Program, Obligation, Statement of Financial Position [Extensible Enumeration]	Accounts payable and accrued liabilities

Supplier Finance Program, Obligation, Currency Impact

No definition available.

Name:	ppg_SupplierFinanceProgramObligationCurrencyImpact
Namespace Prefix:	ppg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of obligation for supplier finance program.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 405
-SubTopic 50
-Name Accounting Standards Codification
-Section 55
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147479468/405-50-50-4

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479468/405-50-50-3

+ Details

Name:	us-gaap_SupplierFinanceProgramObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of decrease in obligation for supplier finance program from settlement.

+ References

+ Details

Name:	us-gaap_SupplierFinanceProgramObligationDecreaseSettlement
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of increase in obligation for supplier finance program.

+ References

+ Details

Name:	us-gaap_SupplierFinanceProgramObligationIncrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_SupplierFinanceProgramObligationRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Indicates line item in statement of financial position that includes obligation for supplier finance program.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
-SubTopic 50
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)(1)
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-URI https://asc.fasb.org/1943274/2147479468/405-50-50-3

+ Details

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Period Type:	instant