Income Taxes (Additional Information) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) subsidiary jurisdiction	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Income Taxes [Line Items]
Effective income tax rate reconciliation, percent	25.10%	23.50%	20.60%
Income before income taxes of non-US operations	$ 1,748	$ 1,381	$ 1,815
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	249	182
Undistributed earnings of foreign subsidiaries	$ 5,800
Number of PPG subsidiaries | subsidiary	265
Number of taxable jurisdictions | jurisdiction	70
Income tax, potential U.S. tax cost for repatriation of foreign earnings	$ 123
Unrecognized tax benefits that would affect the effective tax rate, if recognized	117
U.S.
Income Taxes [Line Items]
Income before income taxes of non-US operations	(75)	288	469
Non United States
Income Taxes [Line Items]
Income before income taxes of non-US operations	$ 1,823	$ 1,093	$ 1,346