Summary of Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2025
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited Consolidated Interim Financial Statements have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission ("SEC") applicable to interim financial statements. While these statements reflect all normal recurring adjustments that are, in the opinion of management, necessary for fair presentation of the results of the interim period, they do not include all of the information and footnotes required by United States generally accepted accounting principles (“GAAP”) for complete financial statements. The unaudited Consolidated Interim Financial Statements should therefore be read in conjunction with the Consolidated Financial Statements and accompanying notes for the year ended December 31, 2024 included in our Annual Report on Form 10-K, as filed with the SEC on February 20, 2025 (our “2024 Form 10-K”). The results of operations for the three and six months ended June 30, 2025 and cash flows for the six months ended June 30, 2025 should not necessarily be taken as indicative of the entire year. All amounts presented are in millions, except per share amounts. We evaluate segment reporting in accordance with ASC 280, Segment Reporting. We concluded that Garrett operates in a single operating segment and a single reportable segment based on the operating results available and evaluated regularly by the chief operating decision maker (“CODM”), which is our Chief Executive Officer, to make decisions about resource allocation and performance assessment. The CODM makes operational performance assessments and resource allocation decisions on a consolidated basis, inclusive of all of the Company’s products across channels and geographies. The preparation of the financial statements in conformity with GAAP requires management to make estimates that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Management bases these estimates on assumptions that it believes to be reasonable under the circumstances. Actual results could differ from the original estimates, requiring adjustments to these balances in future periods.
New Accounting Pronouncements	Recently Adopted Accounting Pronouncements In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. The amendments in this update increase the transparency around income tax information through improvements to disclosures primarily related to the rate reconciliation and income taxes paid information. The Company adopted the new guidance prospectively as of January 1, 2025. Accounting Standards Issued But Not Yet Adopted In March 2024, the SEC adopted a final rule under SEC Release No. 33-11275, The Enhancement and Standardization of Climate-Related Disclosures for Investors, to enhance and standardize climate-related disclosures. The rule will require companies to disclose material Scope 1 and Scope 2 greenhouse gas emissions; climate-related risks, governance, and oversight; and the financial effects of severe weather events and other natural conditions. These disclosures are required to be phased in starting with annual reporting periods beginning in 2025; however, this rule has been stayed pending the outcome of legal challenges, and on March 27, 2025, the SEC withdrew its legal defense of the rule. The Company is currently evaluating the guidance to determine the impact of adoption on its disclosures in the event that the stay is lifted. In November 2024, the FASB issued ASU 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses. The amendments in this update require disclosure of specified information about certain costs and expenses. The guidance is effective for fiscal years beginning after December 15, 2026 on a prospective basis. Early adoption is permitted. The Company is currently evaluating the guidance to determine the impact on its disclosures. There are no other recently issued, but not yet adopted, accounting pronouncements that are expected to have a material impact on the Company's Consolidated Interim Financial Statements and related disclosures.

Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2025

The accompanying unaudited Consolidated Interim Financial Statements have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission ("SEC") applicable to interim financial statements. While these statements reflect all normal recurring adjustments that are, in the opinion of management, necessary for fair presentation of the results of the interim period, they do not include all of the information and footnotes required by United States generally accepted accounting principles (“GAAP”) for complete financial statements. The unaudited Consolidated Interim Financial Statements should therefore be read in conjunction with the Consolidated Financial Statements and accompanying notes for the year ended December 31, 2024 included in our Annual Report on Form 10-K, as filed with the SEC on February 20, 2025 (our “2024 Form 10-K”). The results of operations for the three and six months ended June 30, 2025 and cash flows for the six months ended June 30, 2025 should not necessarily be taken as indicative of the entire year. All amounts presented are in millions, except per share amounts.

We evaluate segment reporting in accordance with ASC 280, Segment Reporting. We concluded that Garrett operates in a single operating segment and a single reportable segment based on the operating results available and evaluated regularly by the chief operating decision maker (“CODM”), which is our Chief Executive Officer, to make decisions about resource allocation and performance assessment. The CODM makes operational performance assessments and resource allocation decisions on a consolidated basis, inclusive of all of the Company’s products across channels and geographies.

The preparation of the financial statements in conformity with GAAP requires management to make estimates that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Management bases these estimates on assumptions that it believes to be reasonable under the circumstances. Actual results could differ from the original estimates, requiring adjustments to these balances in future periods.

New Accounting Pronouncements

Recently Adopted Accounting Pronouncements

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. The amendments in this update increase the transparency around income tax information through improvements to disclosures primarily related to the rate reconciliation and income taxes paid information. The Company adopted the new guidance prospectively as of January 1, 2025.

Accounting Standards Issued But Not Yet Adopted

In March 2024, the SEC adopted a final rule under SEC Release No. 33-11275, The Enhancement and Standardization of Climate-Related Disclosures for Investors, to enhance and standardize climate-related disclosures. The rule will require companies to disclose material Scope 1 and Scope 2 greenhouse gas emissions; climate-related risks, governance, and oversight; and the financial effects of severe weather events and other natural conditions. These disclosures are required to be phased in starting with annual reporting periods beginning in 2025; however, this rule has been stayed pending the outcome of legal challenges, and on March 27, 2025, the SEC withdrew its legal defense of the rule. The Company is currently evaluating the guidance to determine the impact of adoption on its disclosures in the event that the stay is lifted.

In November 2024, the FASB issued ASU 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses. The amendments in this update require disclosure of specified information about certain costs and expenses. The guidance is effective for fiscal years beginning after December 15, 2026 on a prospective basis. Early adoption is permitted. The Company is currently evaluating the guidance to determine the impact on its disclosures.

There are no other recently issued, but not yet adopted, accounting pronouncements that are expected to have a material impact on the Company's Consolidated Interim Financial Statements and related disclosures.