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Share-Based Compensation Arrangement By Share-Based Payment Award, Exercisable Period for Stock Options

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Share Based Compensation Arrangement by Share Based Payment Award, Target Award

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Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

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Amount of noncash expense for share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares authorized for issuance under share-based payment arrangement.

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Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Weighted-average contractual term remaining for exercisable stock option, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Stock-Based Compensation (Additional Information) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Apr. 16, 2026
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares)					6,903,753
Stock-based compensation expense	$ 10	$ (1)	$ 37	$ 35
Total income tax benefit recognized related to the stock-based compensation	$ 3	$ 0	$ 8	$ 8
Stock options granted from the PPG Omnibus Plan			298,402	542,263
Stock options granted from the PPG Omnibus Plan, weighted average fair value per share (in usd per share)			$ 32.82	$ 32.93
Maximum term of the outstanding stock options for the PPG Omnibus Plan and the PPG Stock Plan for certain employees			10 years
PPG Amended Omnibus Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares)					5,403,753
2026 Omnibus Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares)					1,500,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted			450,212	281,856
RSUs granted, weighted average fair value per share (in usd per share)			$ 116.46	$ 111.36
Award vesting period (in years)			3 years
Market Stock Units (MSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted			118,989	0
RSUs granted, weighted average fair value per share (in usd per share)			$ 112.76	$ 0
Award vesting period (in years)			3 years
Stock Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted			60,234	76,925
RSUs granted, weighted average fair value per share (in usd per share)			$ 125.42	$ 114.39
Performance Share Payout			100.00%
Minimum \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Target Award			0.00%
Minimum \| Market Stock Units (MSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Target Award			0.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable period			36 months
Maximum \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Target Award			200.00%
Maximum \| Market Stock Units (MSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Target Award			200.00%