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

Prepayment of future pre-tax cash payments to the trust

No definition available.

Name:	ppg_Prepaymentoffuturepretaxcashpaymentstothetrust
Namespace Prefix:	ppg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Number of shares of PPG stock to be contributed to the asbestos Trust by PPG upon finalization/approval of the 3rd amended PC plan of re-organization.

No definition available.

Name:	ppg_SettlementPayablesShares
Namespace Prefix:	ppg_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Discount rate to be applied to any pre-payments made by PPG to the asbestos Trust.

No definition available.

Name:	ppg_SettlementPrepaymentDiscountRate
Namespace Prefix:	ppg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy.

No definition available.

Name:	us-gaap_InsuranceSettlementsReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Number of pending claims pertaining to a loss contingency.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349