Condensed Consolidated Statement of Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Net sales	$ 4,064	$ 4,100	$ 7,736	$ 7,762
Cost of sales, exclusive of depreciation and amortization	2,190	2,283	4,203	4,348
Selling, general and administrative	956	954	1,875	1,867
Depreciation	91	92	182	179
Amortization	30	33	60	66
Research and development, net	119	123	237	242
Interest expense	31	34	62	63
Interest income	(7)	(10)	(14)	(21)
Business restructuring	0	140	0	140
Asbestos settlement, net	2	3	5	6
Other charges	32	34	53	59
Other income	(53)	(38)	(71)	(69)
Income from continuing operations before income taxes	673	452	1,144	882
Income tax expense	297	110	414	214
Income from continuing operations	376	342	730	668
Income from discontinued operations, net of tax	0	0	0	(1)
Net income attributable to the controlling and noncontrolling interests	376	342	730	669
Less: Net income attributable to noncontrolling interests	(6)	(5)	(13)	(10)
Net income (attributable to PPG)	370	337	717	659
Income from continuing operations, net of tax	370	337	717	658
Income from discontinued operations, net of tax	$ 0	$ 0	$ 0	$ 1
Income from continuing operations, net of tax (in usd per share)	$ 1.38	$ 1.24	$ 2.68	$ 2.41
Income from discontinued operations, net of tax (in usd per share)	0.00	0.00	0.00	0.01
Net income (attributable to PPG) (in usd per share)	1.38	1.24	2.68	2.42
Income from continuing operations, net of tax (in usd per share)	1.37	1.23	2.66	2.39
Income from discontinued operations, net of tax (in usd per share)	0.00	0.00	0.00	0.01
Net income (attributable to PPG) (in usd per share)	1.37	1.23	2.66	2.40
Dividends per common share (in usd per share)	$ 0.40	$ 0.36	$ 0.76	$ 0.69