Interest cost associated with litigation settlements due to recognition of initial liability at net present value.

No definition available.

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

- Definition

Short-term discounted obligation for PPG cash contributions to the asbestos reserve to be paid within 30 days of the "funding effective date" of the settlement.

+ References

No definition available.

+ Details

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

- Definition

Long-term discounted obligation for PPG cash contributions to the asbestos reserve.

+ References

No definition available.

+ Details

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

- Definition

Cash Contributed to the PC Trust

+ References

No definition available.

+ Details

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

- Definition

Change in fair value of PPG Stock

+ References

No definition available.

+ Details

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

- Definition

Commitments and Contingencies Disclosure [Line Items]

+ References

No definition available.

+ Details

Name:	ppg_CommitmentsAndContingenciesDisclosureLineItems
Namespace Prefix:	ppg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value of the PPG stock to be contributed to the Asbestos Trust.

+ References

No definition available.

+ Details

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

- Definition

Forward Contract Indexed to Issuers Equity, Fair Value

+ References

No definition available.

+ Details

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

- Definition

Settlement of equity forward instrument with counterparty

+ References

No definition available.

+ Details

Name:	ppg_Settlementofequityforwardinstrumentwithcounterparty
Namespace Prefix:	ppg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

The entire disclosure for classifying current financial statements, which may be different from classifications in the prior year's financial statements. Disclose any material changes in classification including an explanation of the reason for the change and the areas impacted.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6359566&loc=d3e326-107755

+ Details

Name:	us-gaap_Reclassifications
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	invest_InvestmentAxis=ppg_PittsburghCorningCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_OtherNoncurrentLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_OtherCurrentLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_AsbestosIssueMember
Namespace Prefix:
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Period Type:

Commitments and Contingent Liabilities (Accretion Of Future Funding Obligation) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 09, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Line Items]
Settlement of equity forward instrument with counterparty	$ (49)
Equity Method Investments	21
Company Stock To Be Contributed To Asbestos Trust	308
Asbestos settlement	0		$ 796
Asbestos settlement	0		252
Change in fair value of PPG Stock	34
Fair value of the equity forward arrangement to mitigate the impact of changes in fair value of stock contributed to the asbestos settlement trust	0	$ 258	$ (223)
Accretion Of Interest On Litigation Settlements	6
Cash Contributed to the PC Trust	$ (764)
Reclassifications [Text Block]	-1
Pittsburgh Corning Corporation [Member]
Commitments and Contingencies Disclosure [Line Items]
Equity Method Investments	$ (15)
Other Noncurrent Liabilities [Member]
Commitments and Contingencies Disclosure [Line Items]
Cash Contributed to the PC Trust	(258)
Other Current Liabilities [Member]
Commitments and Contingencies Disclosure [Line Items]
Cash Contributed to the PC Trust	$ (506)
Asbestos Issue [Member]
Commitments and Contingencies Disclosure [Line Items]
Fair value of the equity forward arrangement to mitigate the impact of changes in fair value of stock contributed to the asbestos settlement trust		$ (35)