Income Taxes (Additional Information) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) jurisdiction subsidiary	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Income Taxes [Line Items]
Effective income tax rate reconciliation, percent	23.50%	20.60%	21.40%
Effective income tax rate reconciliation, repatriation of foreign earnings and other reconciling items, percent	2.90%
Income before income taxes of non-US operations	$ 1,381	$ 1,815	$ 1,362
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	182	172
Undistributed earnings of foreign subsidiaries	$ 4,600
Number of PPG subsidiaries | subsidiary	280
Number of taxable jurisdictions | jurisdiction	80
Income tax, potential U.S. tax cost for repatriation of foreign earnings	$ 101
Unrecognized tax benefits that would affect the effective tax rate, if recognized	120
U.S.
Income Taxes [Line Items]
Income before income taxes of non-US operations	288	469	190
Non United States
Income Taxes [Line Items]
Income before income taxes of non-US operations	$ 1,093	$ 1,346	$ 1,172