Derivative Financial Instruments and Hedge Activities (Additional Information) (Details)	3 Months Ended				6 Months Ended		12 Months Ended															6 Months Ended
	Jun. 30, 2013 USD ($) Contract	Mar. 31, 2013	Sep. 30, 2012 USD ($)	Jun. 30, 2012 USD ($)	Jun. 30, 2013 USD ($) Contract	Jun. 30, 2012 USD ($)	Dec. 31, 2012 USD ($)	Jun. 30, 2013 EUR (€)	Dec. 31, 2012 EUR (€)	Jul. 31, 2012	Jul. 30, 2012 USD ($)	Dec. 31, 2011 USD ($)	Jun. 30, 2013 Minimum [Member]	Dec. 31, 2012 Minimum [Member]	Jun. 30, 2013 Maximum [Member]	Dec. 31, 2012 Maximum [Member]	Jun. 30, 2012 Settlement Date 15 March 2013 USD ($)	Dec. 31, 2011 Settlement Date 15 March 2013 USD ($)	Jun. 30, 2013 Settlement Date 15 March 2018 USD ($)	Jun. 30, 2012 Settlement Date 15 March 2018 USD ($)	Dec. 31, 2011 Settlement Date 15 March 2018 USD ($)	Jun. 30, 2013 Foreign currency contracts [Member] USD ($)	Jun. 30, 2013 Cross currency swaps [Member] USD ($)	Jun. 30, 2013 Forward Contracts [Member] USD ($)	Jun. 30, 2013 Foreign Exchange Forward [Member] USD ($)	Jun. 30, 2013 Exclusive of Separation and Merger Transaction [Domain] USD ($)	Jun. 30, 2012 Cash Flow Hedging [Member] Cross currency swaps [Member] USD ($)	Jun. 30, 2012 Other Expense [Member] Cash Flow Hedging [Member] Foreign currency contracts [Member] USD ($)
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Ineffective portion of expense																						$ 0	$ 1,000,000	$ 0	$ 4,000,000		$ 1,000,000	$ 4,000,000
Fair value of foreign currency contracts not designated as hedges	0				0		100,000
Fair value of forward currency contracts liability hedging against the exposure to exchange rates on short-term intercompany transactions denominated in foreign currencies	9,000,000				9,000,000		(1,000,000)
Forward currency contracts hedging against changes in fair value of certain firm sales commitments denominated in foreign currencies, amount converted to the South Korean won	33,500,000.0				33,500,000.0		56,000,000
Contracts conversion period	24 months						21 months
Contracts conversion period end date					Jun. 30, 2015		Sep. 30, 2014
Fair value of forward currency contracts asset (liability) hedging against changes in fair value of certain firm sales commitments denominated in foreign currencies	(600,000.0)				(600,000.0)		3,000,000
U.S. dollar to euro cross currency swap contracts	9				9
Nine U.S. dollar to euro cross currency swap contracts, notional amount												1,160,000,000					600,000,000	600,000,000	560,000,000		560,000,000
Notional amount converted to cash																				1,000,000
Fair value of nine U.S. dollar to euro cross currency swap contracts	(61,000,000)				(61,000,000)		(95,000,000)
Euro-denominated borrowings hedging a portion of PPG's net investment in European operations								300,000,000	300,000,000
Accumulated pretax unrealized translation gains (losses) in AOCI, related to both the euro-denominated borrowings and the cross currency swaps that have been designated as hedges of net investments					26,000,000		9,000,000
Variable interest rate debt of total borrowings													25.00%	25.00%	50.00%	50.00%
Amount interest rate swaps converted from fixed interest rate debt to variable rate debt							445,000,000
Proceeds from termination of interest rate swaps							29,000,000
Derivative Fixed Interest Rate Contract Obligation Term										10 years	10 years
Settlement of forward starting swaps			(121,000,000)
Notional amount of swaps outstanding to hedge exposure to variability of interest payments of future debt refinancing							0				400,000,000
Amount deferred in AOCI	110,000,000				110,000,000
Derivative Instrument, Expected Volatile Period													12 months		18 months
Percentage Decrease in Natural Gas Usage		70.00%
Fair value of natural gas swap contracts to manage exposure to fluctuating natural gas prices	0				0
Shares of PPG stock that are to be contributed to the asbestos settlement trust	1,388,889				1,388,889		1,388,889
Total principal amount payable for PPG shares contributed to the asbestos settlement	62,000,000				62,000,000		62,000,000
Fair value of the equity forward arrangement to mitigate the impact of changes in fair value of stock contributed to the asbestos settlement trust	147,000,000				147,000,000		130,000,000
Other comprehensive pretax gain (loss) related to derivative financial instruments					12,000,000	(9,000,000)
Other comprehensive income net gain (loss), net of tax, related to derivative financial instruments	2,000,000			(12,000,000)	7,000,000	(6,000,000)																				7,000,000
Other comprehensive income net gain (loss), net of tax, realized gains (losses) related to derivative financial instruments					10,000,000	(23,000,000)
Other comprehensive income net gain (loss), net of tax, unrealized (losses) related to derivative financial instruments					$ 22,000,000	$ (32,000,000)