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Cover Page - USD ($) $ in Millions	12 Months Ended
Cover Page - USD ($) $ in Millions	Dec. 31, 2024	Feb. 14, 2025	Jun. 28, 2024
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2024
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-38636
Entity Registrant Name	Garrett Motion Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	82-4873189
Entity Address, Address Line One	La Pièce 16
Entity Address, City or Town	Rolle
Entity Address, Postal Zip Code	1180
Entity Address, Country	CH
City Area Code	41 21
Local Phone Number	695 30 00
Security12b Title	Common Stock, $0.001 par value per share
Trading Symbol	GTX
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 1,077
Entity Common Stock, Shares Outstanding		205,009,801
Documents Incorporated by Reference	Portions of the Registrant’s definitive proxy statement relating to its 2025 annual meeting of shareholders (the “2025 Proxy Statement”) are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated. The 2025 Proxy Statement will be filed with the U.S. Securities and Exchange Commission within 120 days after the end of the fiscal year to which this report relates.
Entity Central Index Key	0001735707
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Amendment Flag	false
Other Address
Document Information [Line Items]
Entity Address, Address Line One	47548 Halyard Drive
Entity Address, City or Town	Plymouth
Entity Address, State or Province	MI
Entity Address, Postal Zip Code	48170
City Area Code	734
Local Phone Number	392 5500