SIGNIFICANT ACCOUNTING POLICIES (Notes)	6 Months Ended
SIGNIFICANT ACCOUNTING POLICIES (Notes)	Jun. 30, 2025
Significant Accounting Policies [Abstract]
Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]	SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation The accompanying unaudited consolidated financial statements have been prepared by Eastman Chemical Company ("Eastman" or the "Company") in accordance and consistent with the accounting policies stated in the Company's 2024 Annual Report on Form 10-K, and should be read in conjunction with the consolidated financial statements in Part II, Item 8 of that report, with the exception of recently adopted accounting standards noted below. The December 31, 2024 financial position data included herein was derived from the consolidated financial statements included in the 2024 Annual Report on Form 10-K but does not include all disclosures required by accounting principles generally accepted in the United States ("GAAP"). In the opinion of management, the unaudited consolidated financial statements include all normal recurring adjustments necessary for the fair presentation of the interim financial information in conformity with GAAP. These statements contain some amounts that are based upon management estimates and judgments. Future actual results could differ from such current estimates. The unaudited consolidated financial statements include assets, liabilities, revenues, and expenses of business ventures in which Eastman has a controlling interest. Eastman accounts for other joint ventures and investments where it exercises significant influence on the equity basis. Intercompany transactions and balances are eliminated in consolidation. Recently Adopted Accounting Standards Accounting Standards Update ("ASU") 2023-05 Business Combination - Joint Venture Formations (Subtopic 805-60): Recognition and Initial Measurement: On January 1, 2025, Eastman adopted this update, which requires that a joint venture must initially measure all contributions received upon its formation at fair value, largely consistent with Topic 805, Business Combinations. The guidance is intended to reduce diversity in practice and provide users of joint venture financial statements with more decision-useful information. This ASU is applied prospectively for all newly formed joint venture entities with a formation date on or after January 1, 2025. The adoption did not have a significant impact on the Company's financial statements and related disclosures. ASU 2023-09 Income Taxes (Topic 740): Improvements to Income Tax Disclosures: On January 1, 2025, Eastman adopted this update on a prospective basis, which modifies annual income tax disclosure requirements. The updated guidance mandates entities to provide more detailed information including specific categories in the income tax rate reconciliation, and the breakdown of income or loss from continuing operations before income tax expense or benefit, for both domestic and foreign. Additionally, entities must disclose income tax expense or benefit from continuing operations, categorized by federal, state, and foreign taxes. The guidance further requires disclosure of income tax payments to various jurisdictions. The adoption did not have a significant impact on the Company's interim financial statements and related disclosures. Accounting Standards Issued But Not Adopted as of June 30, 2025 ASU 2024-03 Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses: The Financial Accounting Standards Board issued this update in November 2024, which requires public companies to provide additional disclosure of certain income statement expense line items. This guidance is intended to improve transparency around the nature of expenses and their impact on financial performance. The ASU is effective for fiscal periods beginning after December 15, 2026 and interim periods beginning after December 15, 2027. Early adoption is permitted. Management is currently evaluating the impact of the changes required by the new standard on the Company's financial statements and related disclosures. Working Capital Management and Off-Balance Sheet Arrangements The Company engages in off-balance sheet, uncommitted accounts receivable factoring programs as a routine part of its ordinary business operations. Through these programs, entire invoices may be sold to third-party financial institutions, the vast majority of which are without recourse. Under these agreements, the Company sells the invoices at face value, less a transaction fee, which substantially equals the carrying value and fair value with no gain or loss recognized, and no credit loss exposure is retained. Available capacity under these programs, which the Company uses as a routine source of working capital funding, is dependent on the level of accounts receivable eligible to be sold and the financial institutions' willingness to purchase such receivables. In addition, certain programs also require that the Company continue to service, administer, and collect the sold accounts receivable at market rates. The total amounts sold under the program in second quarter 2025 and 2024 were $674 million and $650 million, respectively, and $1.4 billion and $1.3 billion in first six months 2025 and 2024, respectively. The Company works with suppliers to optimize payment terms and conditions on accounts payable to enhance timing of working capital and cash flows. Under a supplier finance program, the Company's suppliers may voluntarily sell receivables due from Eastman to a participating financial institution. Eastman's responsibility is limited to making payments on the terms originally negotiated with suppliers, regardless of whether the suppliers sell their receivables to the financial institution. The range of payment terms Eastman negotiates with suppliers are consistent, regardless of whether a supplier participates in the program. No fees are paid by Eastman for the supplier finance program or services fees. Eastman or the financial institution may terminate the program at any time upon 90 days' notice. Confirmed obligations in the supplier finance program of $69 million and $56 million at June 30, 2025 and December 31, 2024, respectively, are included in "Payables and other current liabilities" on the Unaudited Consolidated Statements of Financial Position. Government Grants On May 29, 2025, the U.S. Department of Energy ("DOE") terminated an award related to the Company’s Polyethylene Terephthalate Recycling Decarbonization Project in Longview, Texas. The Company continues to record reimbursements for amounts incurred prior to the date of the award termination and for which the Company is contractually entitled to under an assistance agreement with the DOE. The Company requested $16 million in reimbursements and has received $14 million in reimbursements from the DOE during the first six months of 2025. The Company continues to pursue reinstatement of the award and is actively evaluating the impact of the termination on the project’s scope, timeline, and carrying values of associated assets. For additional government grant information, see Note 1, "Significant Accounting Policies", to the consolidated financial statements in Part II, Item 8 of the Company's 2024 Annual Report on Form 10-K.