Condensed Consolidated Statement of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Net sales	$ 4,691	$ 4,359	$ 8,999	$ 8,240
Cost of sales, exclusive of depreciation and amortization	2,954	2,629	5,652	4,861
Selling, general and administrative	982	955	1,956	1,846
Depreciation	99	96	201	186
Amortization	42	41	85	80
Research and development, net	115	107	230	209
Interest expense	38	31	68	61
Interest income	(11)	(6)	(20)	(12)
Impairment and other related charges, net	(60)	0	230	0
Business restructuring, net	0	(21)	0	(21)
Other income, net	(34)	(66)	(47)	(62)
Income before income taxes	566	593	644	1,092
Income tax expense	118	160	173	274
Income from continuing operations	448	433	471	818
Loss from discontinued operations, net of tax	(2)	0	(2)	0
Net income attributable to the controlling and noncontrolling interests	446	433	469	818
Net income attributable to noncontrolling interests	5	2	10	9
Net income (attributable to PPG)	441	431	459	809
Income from continuing operations, net of tax	443	431	461	809
Loss from discontinued operations, net of tax	$ (2)	$ 0	$ (2)	$ 0
Income (Loss) from Continuing Operations, Per Basic Share	$ 1.87	$ 1.81	$ 1.95	$ 3.40
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	(0.01)	0	(0.01)	0
Earnings per common share (attributable to PPG) (in dollars per share)	1.86	1.81	1.94	3.40
Income (Loss) from Continuing Operations, Per Diluted Share	1.86	1.80	1.94	3.38
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	(0.01)	0	(0.01)	0
Earnings per common share (attributable to PPG) - assuming dilution (in dollars per share)	$ 1.85	$ 1.80	$ 1.93	$ 3.38