SIGNIFICANT ACCOUNTING POLICIES (Notes)	3 Months Ended
SIGNIFICANT ACCOUNTING POLICIES (Notes)	Mar. 31, 2024
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 2023 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, 2023 financial position data included herein was derived from the consolidated financial statements included in the 2023 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 statement 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") 2022-03 Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions: On January 1, 2024, Eastman adopted this update, which states that when measuring the fair value of an asset or a liability, a reporting entity should consider the characteristics of the asset or liability, including restrictions on the sale of the asset or liability, if a market participant also would take those characteristics into account. Key to that determination is the unit of account for the asset or liability being measured at fair value. The adoption did not have a significant impact on the Company's financial statements and related disclosures. Accounting Standards Issued But Not Adopted as of March 31, 2024 ASU 2023-07 Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures: The Financial Accounting Standards Board ("FASB") issued this update in November 2023, which requires enhanced disclosures regarding significant segment expenses and other segment items for public entities on both an annual and interim basis. Specifically, the update requires that entities provide, during interim periods, all disclosures related to a reportable segment's profit or loss and assets that were previously required only on an annual basis. Additionally, this guidance necessitates the disclosure of the title and position of the Chief Operating Decision Maker ("CODM"). The new guidance does not modify how a public entity identifies its operating segments, aggregates them, or applies the quantitative thresholds to determine its reportable segments. This update is effective for fiscal years beginning after December 15, 2023, and interim periods within those fiscal years starting after December 15, 2024. This ASU must be applied retrospectively to all prior periods presented. Management is currently evaluating the impact on the Company's financial statements and related disclosures. ASU 2023-05 Business Combination - Joint Venture Formations (Subtopic 805-60): Recognition and Initial Measurement: The FASB issued this update in August 2023, which states 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 should be applied prospectively and is effective for all newly formed joint venture entities with a formation date on or after January 1, 2025. Early adoption is permitted, and joint ventures formed prior to the adoption date may elect to apply the new guidance retrospectively back to their original formation date. Management is currently evaluating the impact on the Company's financial statements and related disclosures. ASU 2023-09 Income Taxes (Topic 740): Improvements to Income Tax Disclosures: The FASB issued this update in December 2023, which modifies income tax disclosure requirements. The updated guidance requires 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 operations. 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. This ASU is effective for fiscal periods beginning after December 15, 2024, and early adoption is permitted. This ASU should be applied on a prospective basis, although retrospective application 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 has off balance sheet, uncommitted accounts receivable factoring programs under which entire invoices may be sold to third-party financial institutions. The vast majority of these programs are without recourse. Under these programs, 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 first quarter 2024 and 2023 were $698 million and $677 million, 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 platform or services fees. Eastman or the financial institution may terminate the program at any time with immediate effect upon 90 days' notice. Confirmed obligations in the supplier finance program of $79 million and $69 million at March 31, 2024 and December 31, 2023, respectively, are included in "Payables and other current liabilities" on the Unaudited Consolidated Statements of Financial Position.