Condensed Consolidated Statement of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Net sales	$ 3,377	$ 3,624
Cost of sales, exclusive of depreciation and amortization	1,908	2,073
Selling, general and administrative	905	889
Depreciation	93	86
Amortization	36	32
Research and development, net	101	105
Interest expense	32	31
Interest income	(9)	(6)
Business restructuring, net	7	(3)
Other charges	3	14
Other income	(18)	(16)
Income before income taxes	319	419
Income tax expense	71	102
Net income attributable to controlling and noncontrolling interests	248	317
Less: Net income attributable to noncontrolling interests	5	5
Net income (attributable to PPG)	$ 243	$ 312
Earnings Per Share, Basic	$ 1.03	$ 1.32
Earnings Per Share, Diluted	$ 1.02	$ 1.31