Condensed Consolidated Statement of Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Net sales	$ 4,100	$ 4,082	$ 7,762	$ 7,718
Cost of sales, exclusive of depreciation and amortization	2,283	2,306	4,348	4,397
Selling, general and administrative	954	985	1,867	1,885
Depreciation	92	84	179	173
Amortization	33	31	66	61
Research and development, net	123	126	242	246
Interest expense	34	48	63	95
Interest income	(10)	(13)	(21)	(25)
Business restructuring	140	0	140	0
Asbestos settlement, net	3	3	6	6
Other charges	34	19	59	40
Other income	(38)	(31)	(69)	(56)
Income from continuing operations before income taxes	452	524	882	896
Income tax expense	110	125	214	214
Income from continuing operations	342	399	668	682
(Loss) Income from discontinued operations, net of tax	0	(7)	1	1,011
Net income attributable to the controlling and noncontrolling interests	342	392	669	1,693
Less: Net income attributable to noncontrolling interests	(5)	(6)	(10)	(45)
Net income (attributable to PPG)	337	386	659	1,648
Income from continuing operations, net of tax	337	393	658	670
(Loss) Income from discontinued operations, net of tax	$ 0	$ (7)	$ 1	$ 978
Income from continuing operations, net of tax	$ 1.24	$ 1.41	$ 2.41	$ 2.41
(Loss) Income from discontinued operations, net of tax	0.00	(0.02)	0.01	3.52
Net income (attributable to PPG)	1.24	1.39	2.42	5.93
Income from continuing operations, net of tax	1.23	1.40	2.39	2.38
(Loss) Income from discontinued operations, net of tax	0.00	(0.02)	0.01	3.49
Net income (attributable to PPG)	1.23	1.38	2.40	5.87
Dividends per common share	$ 0.36	$ 0.33	$ 0.69	$ 0.64