Financial Instruments, Hedging Activities and Fair Value Measurements (Additional Information) (Details) $ in Millions, € in Billions	3 Months Ended	12 Months Ended
	Mar. 31, 2025 EUR (€)	Dec. 31, 2024 EUR (€)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Assets, Fair Value, Net			$ 39	$ 50
Fair Value of Debt Instrument Designated as a Hedge of Net Investment in Foreign Operations			4,200	3,300
Long-term debt			7,243	5,801
Long-term debt, fair value			7,100	5,634
Finance Lease, Liability			6	7
Short-term debt			13	7
Interest rate swaps
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative, Notional Amount			375
Interest Rate Derivatives, at Fair Value, Net			11	16
Interest rate swaps \| Level 1
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative liabilities			0	0
Interest rate swaps \| Level 2
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative liabilities			11	16
Interest rate swaps \| Level 3
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative liabilities			0	0
Cross currency swaps
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative, Notional Amount			375
Foreign currency forward contracts
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative, Notional Amount			3,300	2,800
Foreign Currency Contracts, Liability, Fair Value Disclosure			31	53
Foreign currency forward contracts \| Level 1 \| Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative liabilities			0	0
Derivative assets			0	0
Foreign currency forward contracts \| Level 2 \| Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative liabilities			49	58
Derivative assets			18	5
Foreign currency forward contracts \| Level 3 \| Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative liabilities			0	0
Derivative assets			$ 0	$ 0
Net Investment Hedging
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Long-term Debt \| €	€ 3.9	€ 3.2

PPG INDUSTRIES INC 10-Q