Condensed Consolidated Statement of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Net sales	$ 4,359	$ 3,015	$ 8,240	$ 6,392
Cost of sales, exclusive of depreciation and amortization	2,629	1,703	4,861	3,611
Selling, general and administrative	955	766	1,846	1,671
Depreciation	96	91	186	184
Amortization	41	32	80	68
Research and development, net	107	86	209	187
Interest expense	31	41	61	73
Interest income	(6)	(5)	(12)	(14)
Business restructuring, net	(21)	165	(21)	172
Other charges	11	21	28	24
Other income	(77)	(11)	(90)	(29)
Income before income taxes	593	126	1,092	445
Income tax expense	160	29	274	100
Income from continuing operations	433	97	818	345
Income from discontinued operations, net of tax	0	3	0	3
Net income attributable to controlling and noncontrolling interests	433	100	818	348
Net (income)/loss attributable to noncontrolling interests	2	(2)	9	3
Net income (attributable to PPG)	431	102	809	345
Income from continuing operations, net of tax	431	99	809	342
Income from discontinued operations, net of tax	$ 0	$ 3	$ 0	$ 3
Income (Loss) from Continuing Operations, Per Basic Share	$ 1.81	$ 0.42	$ 3.40	$ 1.45
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	0	0.01	0	0.01
Earnings per common share (attributable to PPG) (in dollars per share)	1.81	0.43	3.40	1.46
Income (Loss) from Continuing Operations, Per Diluted Share	1.80	0.42	3.38	1.44
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	0	0.01	0	0.01
Earnings per common share (attributable to PPG) - assuming dilution (in dollars per share)	$ 1.80	$ 0.43	$ 3.38	$ 1.45