Condensed Consolidated Statement of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net sales	$ 3,015	$ 4,024	$ 6,392	$ 7,648
Cost of sales, exclusive of depreciation and amortization	1,703	2,288	3,611	4,361
Selling, general and administrative	766	934	1,671	1,823
Depreciation	91	91	184	177
Amortization	32	35	68	67
Research and development, net	86	111	187	216
Interest expense	41	35	73	66
Interest income	(5)	(7)	(14)	(13)
Business restructuring, net	165	176	172	173
Other charges	21	29	24	43
Other income	(11)	(31)	(29)	(47)
Income before income taxes	126	363	445	782
Income tax expense	29	86	100	188
Income from continuing operations	97	277	345	594
Income from discontinued operations, net of tax	3	2	3	2
Net income attributable to controlling and noncontrolling interests	100	279	348	596
Net loss/(income) attributable to noncontrolling interests	(2)	7	3	12
Net income (attributable to PPG)	102	272	345	584
Income from continuing operations, net of tax	99	270	342	582
Income from discontinued operations, net of tax	$ 3	$ 2	$ 3	$ 2
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.42	$ 1.14	$ 1.45	$ 2.46
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	0.01	0.01	0.01	0.01
Earnings Per Share, Basic	0.43	1.15	1.46	2.47
Income (Loss) from Continuing Operations, Per Diluted Share	0.42	1.13	1.44	2.44
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	0.01	0.01	0.01	0.01
Earnings Per Share, Diluted	$ 0.43	$ 1.14	$ 1.45	$ 2.45