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DERIVATIVE AND NON-DERIVATIVE FINANCIAL INSTRUMENTS (Tables) | 12 Months Ended
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Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] | The following table presents the notional amounts outstanding at December 31, 2024 and 2023 associated with Eastman's hedging programs.
Notional Outstanding | December 31, 2024 |  | December 31, 2023
Derivatives designated as cash flow hedges: |  |  |
Foreign Exchange Forward and Option Contracts (in millions) |  |  |
| EUR/USD (in EUR) | €428 |  | €405
Commodity Forward and Collar Contracts |  |  |
| Energy (in million british thermal units) | 10 |  |  | 11 |
Derivatives designated as fair value hedges: |  |  |
Fixed-for-floating interest rate swaps (in millions) | — |  |  | $75
Derivatives designated as net investment hedges: |  |  |
Cross-currency interest rate swaps (in millions) |  |  |
| EUR/USD (in EUR) | €1,543 |  | €1,354
| JPY/USD (in JPY) | ¥7,385 |  | ¥7,385
Non-derivatives designated as net investment hedges: |  |  |
Foreign Currency Net Investment Hedges (in millions) |  |  |
| EUR/USD (in EUR) | €499 |  | €498
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] | The following table presents the financial assets and liabilities valued on a recurring and gross basis and includes where the financial assets and liabilities are located within the Consolidated Statements of Financial Position as of December 31, 2024 and 2023.
The Financial Position and Fair Value Measurements of Hedging Instruments on a Gross Basis
(Dollars in millions) |  |  |  |  |  |
Derivative Type |  | Statements of Financial Position Location |  | December 31, 2024 Level 2 |  | December 31, 2023 Level 2
Derivatives designated as cash flow hedges: |  |  |  |  |  |
Foreign exchange contracts |  | Other current assets |  | $ | 6 |  |  | $ | — |
Foreign exchange contracts |  | Other noncurrent assets |  | 3 |  |  | — |
Derivatives designated as fair value hedges: |  |  |  |  |  |
Fixed-for-floating interest rate swap |  | Other current assets |  | — |  |  | 1 |
Derivatives designated as net investment hedges: |  |  |  |  |  |
Cross-currency interest rate swaps |  | Other current assets |  | 19 |  |  | 8 |
Cross-currency interest rate swaps |  | Other noncurrent assets |  | 69 |  |  | 18 |
Total Derivative Assets |  |  |  | $ | 97 |  |  | $ | 27 |
Derivatives designated as cash flow hedges: |  |  |  |  |  |
Commodity contracts |  | Payables and other current liabilities |  | $ | 4 |  |  | $ | 19 |
Foreign exchange contracts |  | Payables and other current liabilities |  | — |  |  | 8 |
Foreign exchange contracts |  | Other long-term liabilities |  | — |  |  | 2 |
Derivatives designated as fair value hedges: |  |  |  |  |  |
Fixed-for-floating interest rate swap |  | Long-term borrowings |  | — |  |  | 3 |
Derivatives designated as net investment hedges: |  |  |  |  |  |
Cross-currency interest rate swaps |  | Payables and other current liabilities |  | 4 |  |  | — |
Cross-currency interest rate swaps |  | Other long-term liabilities |  | 54 |  |  | 61 |
Total Derivative Liabilities |  |  |  | $ | 62 |  |  | $ | 93 |
Total Net Derivative Assets (Liabilities) |  |  |  | $ | 35 |  |  | $ | (66) |
Cumulative basis adjustments for fair value hedges on balance sheet [Table Text Block] | As of December 31, 2024 and 2023, the following amounts were included within the Consolidated Statements of Financial Position related to cumulative basis adjustments for fair value hedges.
(Dollars in millions) |  | Carrying amount of the hedged liabilities |  | Cumulative amount of fair value hedging loss adjustment included in the carrying amount of the hedged liability
Line item in the Consolidated Statements of Financial Position in which the hedged item is included |  | December 31, 2024 |  | December 31, 2023 |  | December 31, 2024 |  | December 31, 2023
Long-term borrowings |  | $ | — |  |  | $ | 72 |  |  | $ | — |  |  | $ | (3) |
Derivative Instruments, Gain (Loss) [Table Text Block] | The following table presents the effect of the Company's hedging instruments on Other comprehensive income (loss), net of tax ("OCI") and financial performance for the twelve months ended December 31, 2024, 2023, and 2022:
(Dollars in millions) |  | Change in amount of after tax gain/(loss) recognized in OCI on Derivatives |  | Pre-tax amount of gain/(loss) reclassified from AOCI into income
|  | December 31, |  | December 31,
Hedging Relationships |  | 2024 |  | 2023 |  | 2022 |  | 2024 |  | 2023 |  | 2022
Derivatives in cash flow hedging relationships: |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  | $ | 11 |  |  | $ | (14) |  |  | $ | (11) |  |  | $ | (25) |  |  | $ | (10) |  |  | $ | 36 |
Foreign exchange contracts |  | 20 |  |  | (14) |  |  | (2) |  |  | 8 |  |  | 12 |  |  | 45 |
Forward starting interest rate and treasury lock swap contracts |  | 2 |  |  | 2 |  |  | 10 |  |  | (3) |  |  | (3) |  |  | (6) |
Non-derivatives in net investment hedging relationships (pre-tax): |  |  |  |  |  |  |  |  |  |  |  |
Net investment hedges |  | 33 |  |  | (30) |  |  | 85 |  |  | — |  |  | — |  |  | — |
Derivatives in net investment hedging relationships (pre-tax): |  |  |  |  |  |  |  |  |  |  |  |
Cross-currency interest rate swaps |  | 107 |  |  | (32) |  |  | 63 |  |  | — |  |  | — |  |  | — |
Cross-currency interest rate swaps excluded component |  | (26) |  |  | (42) |  |  | (1) |  |  | — |  |  | — |  |  | — |
The following table presents the effect of fair value and cash flow hedge accounting on the Consolidated Statements of Earnings, Comprehensive Income and Retained Earnings for 2024, 2023, and 2022.
Location and Amount of Gain or (Loss) Recognized in Earnings on Fair Value and Cash Flow Hedging Relationships
| Twelve Months
| 2024 |  | 2023 |  | 2022
(Dollars in millions) | Sales |  | Cost of Sales |  | Net interest expense |  | Sales |  | Cost of Sales |  | Net interest expense |  | Sales |  | Cost of Sales |  | Net interest expense
Total amounts of income and expense line items presented in the Consolidated Statements of Earnings, Comprehensive Income and Retained Earnings in which the effects of fair value or cash flow hedges are recognized
| $ | 9,382 |  |  | $ | 7,092 |  |  | $ | 200 |  |  | $ | 9,210 |  |  | $ | 7,149 |  |  | $ | 215 |  |  | $ | 10,580 |  |  | $ | 8,443 |  |  | $ | 182 |
The effects of fair value and cash flow hedging: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain or (loss) on fair value hedging relationships: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest contracts (fixed-for-floating interest rate swaps): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hedged items |  |  |  |  | 4 |  |  |  |  |  |  | 3 |  |  |  |  |  |  | 2 |
Derivatives designated as hedging instruments |  |  |  |  | (4) |  |  |  |  |  |  | (3) |  |  |  |  |  |  | (2) |
Gain or (loss) on cash flow hedging relationships: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest contracts (forward starting interest rate and treasury lock swap contracts): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount reclassified from AOCI into earnings |  |  |  |  | (3) |  |  |  |  |  |  | (3) |  |  |  |  |  |  | (6) |
Commodity Contracts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount reclassified from AOCI into earnings |  |  | (25) |  |  |  |  |  |  | (10) |  |  |  |  |  |  | 36 |  |  |
Foreign Exchange Contracts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount reclassified from AOCI into earnings | 8 |  |  |  |  |  |  | 12 |  |  |  |  |  |  | 45 |  |  |  |  |

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A + Details
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