Condensed Consolidated Statement of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Net sales	$ 4,575	$ 4,644	$ 13,680	$ 13,896
Cost of sales, exclusive of depreciation and amortization	2,663	2,752	7,842	8,214
Selling, general and administrative	1,062	1,047	3,203	3,108
Depreciation	97	102	298	287
Amortization	32	40	106	121
Research and development, net	105	108	325	322
Interest expense	67	64	184	190
Interest income	(48)	(39)	(135)	(96)
Pension settlement charge	0	0	0	190
Other (income)/charges, net	(14)	13	15	4
Income before income taxes	611	557	1,842	1,556
Income tax expense	137	121	422	350
Net income attributable to the controlling and noncontrolling interests	474	436	1,420	1,206
Net income attributable to noncontrolling interests	6	10	24	26
Net income (attributable to PPG)	$ 468	$ 426	$ 1,396	$ 1,180
Earnings per common share (attributable to PPG) (in dollars per share)	$ 2.01	$ 1.80	$ 5.96	$ 5.00
Earnings per common share (attributable to PPG) - assuming dilution (in dollars per share)	$ 2.00	$ 1.79	$ 5.93	$ 4.97