Condensed Consolidated Statement of Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Net sales	$ 3,872	$ 3,935	$ 11,634	$ 11,653
Cost of sales, exclusive of depreciation and amortization	2,150	2,229	6,498	6,626
Selling, general and administrative	890	941	2,757	2,826
Depreciation	92	87	271	260
Amortization	33	32	99	93
Research and development, net	119	120	361	366
Interest expense	31	47	94	142
Interest income	(10)	(13)	(31)	(38)
Business restructuring	0	0	140	0
Asbestos settlement, net	3	3	9	9
Other charges	23	150	82	190
Other income	(40)	(160)	(109)	(216)
Income from continuing operations before income taxes	581	499	1,463	1,395
Income tax expense	142	116	356	330
Income from continuing operations	439	383	1,107	1,065
(Loss) Income from discontinued operations, net of tax	0	6	(1)	(1,005)
Net income attributable to the controlling and noncontrolling interests	439	377	1,108	2,070
Less: Net income attributable to noncontrolling interests	(6)	(6)	(16)	(51)
Net income (attributable to PPG)	433	371	1,092	2,019
Income from continuing operations, net of tax	433	377	1,091	1,047
(Loss) Income from discontinued operations, net of tax	$ 0	$ (6)	$ 1	$ 972
Income from continuing operations, net of tax	$ 1.60	$ 1.36	$ 4.00	$ 3.79
(Loss) Income from discontinued operations, net of tax	0.00	(0.02)	0.01	3.52
Net income (attributable to PPG)	1.60	1.34	4.01	7.31
Income from continuing operations, net of tax	1.59	1.35	3.97	3.74
(Loss) Income from discontinued operations, net of tax	0.00	(0.02)	0.01	3.47
Net income (attributable to PPG)	1.59	1.33	3.98	7.21
Dividends per common share	$ 0.36	$ 0.34	$ 1.05	$ 0.98