BASIS OF PRESENTATION (Policies)	9 Months Ended
BASIS OF PRESENTATION (Policies)	Sep. 30, 2025
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation Qnity has historically operated as a part of DuPont; consequently, stand-alone interim financial statements have not historically been prepared for Qnity. The unaudited interim Combined Financial Statements have been derived from DuPont’s accounting records as if Qnity’s operations had been conducted independently from those of DuPont and were prepared on a stand-alone basis in accordance with U.S. GAAP. The historical results of operations, financial position and cash flows of Qnity presented in these unaudited interim Combined Financial Statements may not be indicative of what they would have been had Qnity actually been an independent stand-alone entity, nor are they necessarily indicative of Qnity’s future results of operations, financial position and cash flows. The unaudited interim Combined Statements of Operations and Comprehensive Income (Loss) include all revenues and costs directly attributable to Qnity, including costs for facilities, functions and services used by Qnity. The unaudited interim Combined Statements of Operations and Comprehensive Income (Loss) reflect allocations of general corporate expenses from DuPont including, but not limited to, executive management, finance, legal, information technology, employee benefits administration, treasury, risk management, procurement and other shared services, and any restructuring related to these functions. These allocations were made on the basis of revenue, expenses, headcount or other relevant measures. Management considers these allocations to be an overall reasonable reflection of the utilization of services by, or the benefits provided to, Qnity, in the aggregate. Management does not believe, however, that it is practicable to estimate what these expenses would have been had the Company operated as an independent entity, including any expenses associated with obtaining any of these services from unaffiliated entities. The allocations, therefore, may not reflect the expenses Qnity would have incurred as a stand-alone company for the periods presented. The Qnity unaudited interim Condensed Combined Balance Sheets include assets and liabilities that are specifically identifiable or otherwise attributable to Qnity, including subsidiaries and affiliates in which Qnity has a controlling financial interest or is the primary beneficiary. DuPont used a centralized approach to cash management and financing of its operations and DuPont funded Qnity’s operating and investing activities as needed. Cash transfers to the cash management accounts of DuPont were reflected in the unaudited interim Combined Statements of Cash Flows as “Net transfers (to) from Parent.” Transactions between Qnity and DuPont and their affiliates and other associated companies are reflected in the unaudited interim Combined Financial Statements and disclosed as related party transactions when material. Related party transactions with DuPont are included in Note 5. The unaudited interim Combined Financial Statements include the accounts of Qnity and subsidiaries in which a controlling interest is maintained. For those combined subsidiaries in which Qnity’s ownership is less than 100%, the outside stockholders’ interests are shown as noncontrolling interests. Intracompany accounts and transactions within Qnity have been eliminated in the preparation of the accompanying unaudited interim Combined Financial Statements. Intercompany transactions with DuPont were deemed to have been paid in the periods the costs were incurred. Qnity did not file separate tax returns in the U.S. for federal, certain state and local tax purposes, nor in foreign tax jurisdictions, as Qnity was included in the tax grouping of DuPont and its affiliate entities within the respective jurisdictions. The provision for income taxes included in these unaudited interim Combined Financial Statements has been calculated using the separate return basis, as if Qnity filed separate tax returns. Qnity’s Provision for income taxes as presented in the unaudited interim Combined Financial Statements may not be indicative of the income taxes that Qnity will generate in the future. In jurisdictions where Qnity has been included in the tax returns filed by DuPont, any income taxes payable resulting from the related income tax provision are considered settled in cash with DuPont immediately and therefore have been reflected in the balance sheet within “Parent company net investment”.
Recently Adopted Accounting Guidance and Accounting Guidance Issued But Not Adopted	Recently Adopted Accounting Guidance In November 2023, the FASB issued Accounting Standards Update No. 2023-07, "Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures" ("ASU 2023-07") to improve disclosure requirements about reportable segments and address requests from investors for additional, more detailed information about a reportable segment’s expenses. The new guidance requires disclosures of significant segment expenses regularly provided to the Chief Operating Decision Maker ("CODM") and included in reported measures of segment profit and loss. Disclosure of the title and position of the CODM is required. The guidance requires interim and annual disclosures about a reportable segment's profit or loss and assets. Additionally, the guidance requires disclosure of other segment items by reportable segment including a description of its composition. The amendments in ASU 2023-07 are effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024, on a retrospective basis. The disclosures have been implemented as required for the three and nine months ended September 30, 2025 and 2024. See Note 16 for more information. Accounting Guidance Issued But Not Adopted at September 30, 2025 In December 2023, the FASB issued Accounting Standards Update No. 2023-09, "Income Taxes (Topic 740): Improvements to Income Tax Disclosures" ("ASU 2023-09") to improve transparency and disclosure requirements for the rate reconciliation, income taxes paid and other tax disclosures. The amendments in ASU 2023-09 are effective for annual fiscal years beginning after December 15, 2024, on a prospective basis. The disclosures will be implemented as required for the year-ended December 31, 2025. The Company is currently evaluating the impact of adopting this guidance. In November 2024, the FASB issued Accounting Standards Update No. 2024-03, "Income Statement: Reporting Comprehensive Income (Topic 220): Expense Disaggregation Disclosures" ("ASU 2024-03") to improve disclosures about the nature of expenses within line items on the statements of operations. The amendments in ASU 2024-03 are effective for the Company's 2027 annual report and subsequent interim periods; however, early adoption is permitted. The amendments can be applied prospectively or retrospectively to all periods presented. The Company is currently evaluating the impact of adopting this guidance. In September 2025, the FASB issued Accounting Standards Update No. 2025-06, “Intangibles—Goodwill and Other—Internal- Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software” (“ASU 2025-06”) to modernize the accounting for internal-use software costs and improve operability of the guidance across different software development project stages. The amendments in ASU 2025-06 are effective for the Company’s 2028 annual and quarterly reports; however, early adoption is permitted. The amendments can be applied prospectively, retrospectively, or using a modified transition approach. The Company is currently evaluating the impact of adopting this guidance.