Fair Value Measurement (Details) - EBP 385 - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]
Investments at fair value	$ 8,051	$ 14,551
Cash equivalents
EBP, Investment, Fair Value and NAV [Line Items]
Investments at fair value	690	1,767
Mutual funds
EBP, Investment, Fair Value and NAV [Line Items]
Investments at fair value	6,387	11,072
PPG Industries, Inc. common stock
EBP, Investment, Fair Value and NAV [Line Items]
Investments at fair value	974	1,712
Level 1
EBP, Investment, Fair Value and NAV [Line Items]
Investments at fair value	8,051	14,551
Level 1 \| Cash equivalents
EBP, Investment, Fair Value and NAV [Line Items]
Investments at fair value	690	1,767
Level 1 \| Mutual funds
EBP, Investment, Fair Value and NAV [Line Items]
Investments at fair value	6,387	11,072
Level 1 \| PPG Industries, Inc. common stock
EBP, Investment, Fair Value and NAV [Line Items]
Investments at fair value	974	1,712
Level 2
EBP, Investment, Fair Value and NAV [Line Items]
Investments at fair value	0	0
Level 2 \| Cash equivalents
EBP, Investment, Fair Value and NAV [Line Items]
Investments at fair value	0	0
Level 2 \| Mutual funds
EBP, Investment, Fair Value and NAV [Line Items]
Investments at fair value	0	0
Level 2 \| PPG Industries, Inc. common stock
EBP, Investment, Fair Value and NAV [Line Items]
Investments at fair value	0	0
Level 3
EBP, Investment, Fair Value and NAV [Line Items]
Investments at fair value	0	0
Level 3 \| Cash equivalents
EBP, Investment, Fair Value and NAV [Line Items]
Investments at fair value	0	0
Level 3 \| Mutual funds
EBP, Investment, Fair Value and NAV [Line Items]
Investments at fair value	0	0
Level 3 \| PPG Industries, Inc. common stock
EBP, Investment, Fair Value and NAV [Line Items]
Investments at fair value	$ 0	$ 0

Fair value of investment, excluding plan interest in master trust, held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Includes, but is not limited to, derivative, investment measured at net asset value per share as practical expedient, and insurance contract not meeting fully-benefit responsive investment criteria.

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+ Details

- Definition

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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