v3.25.2
Cover - shares
 6 Months Ended
Jun. 30, 2025
Jul. 18, 2025
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
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 1 734  
Local Phone Number 392 5500  
Title of 12(b) Security Common Stock, $0.001 par value per share  
Trading Symbol GTX  
Security Exchange Name NASDAQ  
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  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   201,575,459
Amendment Flag false  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Entity Central Index Key 0001735707  
Current Fiscal Year End Date --12-31  
Other Address    
Document Information [Line Items]    
Entity Address, Address Line One 47548 Halyard Drive  
Entity Address, City or Town Plymouth  
Entity Address, Postal Zip Code 48170  
Entity Address, State or Province MI  
City Area Code 41  
Local Phone Number 21 695 30 00