Condensed Consolidated Statement of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Net sales	$ 4,311	$ 4,380
Cost of sales, exclusive of depreciation and amortization	2,445	2,596
Selling, general and administrative	1,064	992
Depreciation	103	92
Amortization	38	41
Research and development, net	109	104
Interest expense	55	59
Interest income	(42)	(25)
Pension settlement charge	0	190
Other charges/(income), net	1	(22)
Income before income taxes	538	353
Income tax expense	129	80
Net income attributable to the controlling and noncontrolling interests	409	273
Net income attributable to noncontrolling interests	9	9
Net income (attributable to PPG)	$ 400	$ 264
Earnings per common share (attributable to PPG) (in dollars per share)	$ 1.70	$ 1.12
Earnings per common share (attributable to PPG) - assuming dilution (in dollars per share)	$ 1.69	$ 1.11