Commitments and Contingent Liabilities (Additional Information) (Detail) (USD $)	1 Months Ended	12 Months Ended					3 Months Ended			3 Months Ended		12 Months Ended						12 Months Ended			3 Months Ended		12 Months Ended								12 Months Ended							3 Months Ended		1 Months Ended		12 Months Ended		9 Months Ended
	Dec. 31, 2009 LegalMatter	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010 LegalMatter	Jan. 31, 2000 Plaintiff	Mar. 31, 2012 New Jersey Remediation Sites	Dec. 31, 2013 New Jersey Remediation Sites ton	Dec. 31, 2012 New Jersey Remediation Sites	Sep. 30, 2013 Jersey City Manufacturing Plant	Sep. 30, 2006 Jersey City Manufacturing Plant	Dec. 31, 2013 Jersey City Manufacturing Plant	Dec. 31, 2012 Jersey City Manufacturing Plant	Dec. 31, 2011 Jersey City Manufacturing Plant	Dec. 31, 2011 Calcasieu River And Two Chemicals Plants [Member]	Dec. 31, 2013 Other Environmental Contingencies	Dec. 31, 2011 Other Environmental Contingencies	Dec. 31, 2013 Administrative Content Order 1990 ACO Location	Dec. 31, 2013 Soil Treatment, Transportation And Disposal Of Excavated Soil	Dec. 31, 2013 Construction Services (Related To Soil Excavation, Groundwater Management And Site Security)	Sep. 30, 2008 Orphan Sites Settlement Location	Dec. 31, 2013 Orphan Sites Settlement Location	Dec. 31, 2013 Judicial Consent Order	Dec. 31, 2011 Calcasieu River sites	Dec. 31, 2013 Ongoing Investigation Activities Administrative Content Order 1990 ACO Location	Dec. 31, 2013 Finished Environmental Remediation Administrative Content Order 1990 ACO Location	Dec. 31, 2013 Unfinished Environmental Remediation Administrative Content Order 1990 ACO Location	Sep. 30, 2008 Unfinished Environmental Remediation Orphan Sites Settlement Location	Dec. 31, 2013 Unfinished Environmental Remediation Judicial Consent Order Location	Dec. 31, 2013 Partially Liable Environmental Remediation Orphan Sites Settlement Location	Dec. 31, 2013 Maximum	Dec. 31, 2013 Minimum	Dec. 31, 2013 Minimum Jersey City Manufacturing Plant	Dec. 31, 2013 Minimum Administrative Content Order 1990 ACO ton	Dec. 31, 2013 Asbestos Issue LegalMatter	Dec. 31, 2012 Asbestos Issue	Dec. 31, 2008 Asbestos Issue	Mar. 31, 2000 Pittsburgh Corning Corporation	Dec. 31, 2013 Pittsburgh Corning Corporation	Dec. 31, 2008 Pittsburgh Corning Corporation Asbestos Issue	May 14, 2002 Pittsburgh Corning Corporation Asbestos Issue	Dec. 31, 2013 Pittsburgh Corning Corporation Asbestos Issue	Dec. 31, 2011 Pittsburgh Corning Corporation Asbestos Issue	Sep. 30, 2012 Third Amendment Pittsburgh Corning Corporation Asbestos Issue
Commitments and Contingencies Disclosure [Line Items]
Loss Contingency, New Claims Filed, Number					30
Asbestos [Abstract]
PPG percent ownership interest																																							50.00%
Number of pending cases																																			114,000
After-tax charge, write-off of investment in PC, related to PC filing for Chapter 11 Bankruptcy																																						$ 35,000,000
Number of days after effective date of a confirmed reorganization plan																																						30 days
Number of days after second amended reorganization plan																																									30 days
Agreement to convey assets to the PC asbestos settlement trust (the "Trust"), shares of PPG common stock																																								1,388,889	1,388,889
Future PPG cash payments to the Trust																																								825,000,000	998,000,000
Fixed payment schedule, period																																									21 years
Fixed payment schedule, effective date																																									2003-06-30
Future PPG cash payments to the Trust, prepayment discount rate																																								5.50%	5.50%
Future PPG legal fees and expenses on behalf of the Trust																																									30,000,000
Future cash payments to the Trust by PPG's participating historical insurance carriers																																								1,700,000,000	1,700,000,000
Future cash payments to the Trust by PPG's participating historical insurance carriers, prepayment discount rate																																								5.50%	5.50%
Period of funding effective period																																												30 days
Reduction in cash obligation to the Trust, corresponding increase in reserve for PPG claims responsibility																																					162,000,000
PPG's reserve for asbestos-related claims that will not be channeled to the Trust																																			162,000,000	162,000,000
Total obligation																																										1,008,000,000	920,000,000
Obligation reported as a current liability		763,000,000	683,000,000																																							763,000,000	683,000,000
Obligation reported as a non-current liability		245,000,000	237,000,000																																							245,000,000	237,000,000
Accretion of asbestos liability																																										95,000,000
PC-related claims at trial that PPG was found not responsible	2
Number of plaintiffs one jury found PPG, for the first time, partly responsible for injuries						5
Environmental Matters [Abstract]
Reserves for environmental contingencies		310,000,000		332,000,000				204,000,000	221,000,000			204,000,000		221,000,000	31,000,000	106,000,000	80,000,000
Reserves for environmental contingencies classified as current liabilities		105,000,000		101,000,000
Number of sites																						3		2
Cash outlays related to environmental remediation		120,000,000	62,000,000	48,000,000
Pretax charges for environmental remediation costs		108,000,000	166,000,000	9,000,000			145,000,000			89,000,000	165,000,000	101,000,000	159,000,000
Historical low end of range of annual environmental remediation expense over the past 15 years		10,000,000
Historical high end of range of annual environmental remediation expense over the past 15 years		30,000,000
Expected cash payments for environmental remediation costs for remaining fiscal year		100,000,000
Expectations of cash outlays for environmental remediation costs, low estimate per year from 2012 through 2015																															30,000,000	10,000,000
Total number of sites to be remediated																		61			53				6	47	14	6	20	10
PPG agrees to reimburse the NJDEP for a portion of past costs																					5,000,000
Completion period for investigation and remediation of the soils and sources of contamination of all ACO sites and the six orphan sites for which PPG has accepted sole responsibility																		2014
Judicial Consent Order combining ACO and Orphan Sites Settlement, reparation claim payable to the City of Jersey City																							1,500,000
Payment time period																							5 years
Soil that may be potentially impacted for all remaining sites (in tons)								1,000,000																										70,000
Percentage of the total remaining reserve																			64.00%	28.00%
Time period for final resolution of New Jersey Chrome site legal matters																																	2 years
Unreserved loss contingencies related to environmental matters, low estimate		100,000,000	100,000,000
Unreserved loss contingencies related to environmental matters, high estimate		$ 200,000,000	$ 275,000,000
Other Contingency Matters [Abstract]
Number of sites																						3		2