Condensed Consolidated Statement of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
Net sales	$ 4,794	$ 4,872	$ 9,105	$ 9,252
Cost of sales, exclusive of depreciation and amortization	2,734	2,866	5,179	5,462
Selling, general and administrative	1,077	1,069	2,141	2,061
Depreciation	98	93	201	185
Amortization	36	40	74	81
Research and development, net	111	110	220	214
Interest expense	62	67	117	126
Interest income	(45)	(32)	(87)	(57)
Pension settlement charge	0	0	0	190
Other charges/(income), net	28	13	29	(9)
Income before income taxes	693	646	1,231	999
Income tax expense	156	149	285	229
Net income attributable to the controlling and noncontrolling interests	537	497	946	770
Net income attributable to noncontrolling interests	9	7	18	16
Net income (attributable to PPG)	$ 528	$ 490	$ 928	$ 754
Earnings per common share (attributable to PPG) (in dollars per share)	$ 2.25	$ 2.08	$ 3.95	$ 3.20
Earnings per common share (attributable to PPG) - assuming dilution (in dollars per share)	$ 2.24	$ 2.06	$ 3.93	$ 3.18