Condensed Consolidated Statement of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Net sales	$ 3,624	$ 3,781
Cost of Goods and Services Sold	2,073	2,181
Selling, general and administrative	889	906
Depreciation	86	87
Amortization	32	36
Research and development, net	105	112
Interest expense	31	26
Interest income	(6)	(5)
Business restructuring charge	(3)	0
Other charges	14	41
Other income	(16)	(24)
Income before income taxes	419	421
Income tax expense	102	87
Income from continuing operations	317	334
Income from discontinued operations, net of tax	0	6
Net income attributable to controlling and noncontrolling interests	317	340
Less: Net income attributable to noncontrolling interests	5	6
Net income (attributable to PPG)	312	334
Income from continuing operations, net of tax	312	328
Income from discontinued operations, net of tax	$ 0	$ 6
Income from continuing operations, net of tax (in usd per share)	$ 1.32	$ 1.32
Income from discontinued operations, net of tax (in usd per share)	0.00	0.02
Net income (attributable to PPG) (in usd per share)	1.32	1.34
Income from continuing operations, net of tax (in usd per share)	1.31	1.31
Income from discontinued operations, net of tax (in usd per share)	0.00	0.02
Net income (attributable to PPG) (in usd per share)	$ 1.31	$ 1.33