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Commitments and Contingent Liabilities Asbestos Information (Details) $ in Millions	Sep. 30, 2021 USD ($)
Other Reserves	$ 190
Asbestos Issue [Member]
Loss Contingency, Pending Claims, Number	700
Other Reserves	$ 162

X

- Definition

Difference between the 2nd and 3rd amended PC plan of re-organization in cash to be contributed to the Trust by PPG which has been established as a reserve for asbestos-related claims that will not be channeled to the Trust.

+ References

No definition available.

+ Details

Name:	ppg_OtherReserves
Namespace Prefix:	ppg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Number of pending claims pertaining to a loss contingency.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349

+ Details

Name:	us-gaap_LossContingencyPendingClaimsNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_AsbestosIssueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: