Condensed Consolidated Statement of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Net sales	$ 4,872	$ 4,691	$ 9,252	$ 8,999
Cost of sales, exclusive of depreciation and amortization	2,866	2,954	5,462	5,652
Selling, general and administrative	1,069	982	2,061	1,956
Depreciation	93	99	185	201
Amortization	40	42	81	85
Research and development, net	110	115	214	230
Interest expense	67	38	126	68
Interest income	(32)	(11)	(57)	(20)
Impairment and other related charges, net	0	(60)	0	230
Pension settlement charge	0	0	190	0
Other charges/(income), net	13	(34)	(9)	(47)
Income before income taxes	646	566	999	644
Income tax expense	149	118	229	173
Income from continuing operations	497	448	770	471
Loss from discontinued operations, net of tax	0	(2)	0	(2)
Net income attributable to the controlling and noncontrolling interests	497	446	770	469
Net income attributable to noncontrolling interests	7	5	16	10
Net income (attributable to PPG)	490	441	754	459
Income from continuing operations, net of tax	490	443	754	461
Loss from discontinued operations, net of tax	$ 0	$ (2)	$ 0	$ (2)
Income from continuing operations (in dollars per share)	$ 2.08	$ 1.87	$ 3.20	$ 1.95
Loss from discontinued operations (in dollars per share)	0	(0.01)	0	(0.01)
Earnings per common share (attributable to PPG) (in dollars per share)	2.08	1.86	3.20	1.94
Income from continuing operations, per diluted share (in dollars per share)	2.06	1.86	3.18	1.94
Loss from discontinued operations, per diluted share (in dollars per share)	0	(0.01)	0	(0.01)
Earnings per common share (attributable to PPG) - assuming dilution (in dollars per share)	$ 2.06	$ 1.85	$ 3.18	$ 1.93