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RETIREMENT PLANS | 6 Months Ended
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Jun. 30, 2023
Retirement Benefits [Abstract] |
RETIREMENT PLANS | RETIREMENT PLANS Defined Benefit Pension Plans and Other Postretirement Benefit Plans Eastman maintains defined benefit pension plans that provide eligible employees with retirement benefits. In addition, Eastman provides life insurance for eligible retirees hired prior to January 1, 2007. Company funding is provided for eligible Medicare retirees hired prior to January 1, 2007 with a health reimbursement arrangement. Costs recognized for these benefits are estimated amounts, which may change as actual costs for the year are determined. For additional information regarding retirement plans, see Note 11, "Retirement Plans", to the consolidated financial statements in Part II, Item 8 of the Company's 2022 Annual Report on Form 10-K. Components of net periodic benefit (credit) cost were as follows:
| Second Quarter
| Pension Plans |  | Other Postretirement Benefit Plans
| 2023 |  | 2022 |  | 2023 |  | 2022
(Dollars in millions) | U.S. |  | Non-U.S. |  | U.S. |  | Non-U.S. |  |  |  |
Service cost | $ | 5 |  |  | $ | 2 |  |  | $ | 6 |  |  | $ | 3 |  |  | $ | — |  |  | $ | — |
Interest cost | 20 |  |  | 7 |  |  | 11 |  |  | 4 |  |  | 6 |  |  | 3 |
Expected return on assets | (22) |  |  | (7) |  |  | (32) |  |  | (8) |  |  | (1) |  |  | (1) |
Amortization of: |  |  |  |  |  |  |  |  |  |  |
Prior service credit, net | — |  |  | — |  |  | — |  |  | — |  |  | (6) |  |  | (8) |
Mark-to-market pension and other postretirement benefits (gain) loss (1) | — |  |  | — |  |  | 7 |  |  | (10) |  |  | — |  |  | — |
Net periodic benefit (credit) cost | $ | 3 |  |  | $ | 2 |  |  | $ | (8) |  |  | $ | (11) |  |  | $ | (1) |  |  | $ | (6) |
| First Six Months
| Pension Plans |  | Other Postretirement Benefit Plans
| 2023 |  | 2022 |  | 2023 |  | 2022
(Dollars in millions) | U.S. |  | Non-U.S. |  | U.S. |  | Non-U.S. |  |  |  |
Service cost | $ | 11 |  |  | $ | 4 |  |  | $ | 12 |  |  | $ | 7 |  |  | $ | — |  |  | $ | — |
Interest cost | 39 |  |  | 14 |  |  | 22 |  |  | 8 |  |  | 13 |  |  | 7 |
Expected return on assets | (44) |  |  | (13) |  |  | (64) |  |  | (17) |  |  | (2) |  |  | (2) |
Amortization of: |  |  |  |  |  |  |  |  |  |  |
Prior service credit, net | — |  |  | — |  |  | — |  |  | — |  |  | (13) |  |  | (16) |
Mark-to-market pension and other postretirement benefits (gain) loss (1) | — |  |  | — |  |  | 7 |  |  | (10) |  |  | — |  |  | — |
Net periodic benefit (credit) cost | $ | 6 |  |  | $ | 5 |  |  | $ | (23) |  |  | $ | (12) |  |  | $ | (2) |  |  | $ | (11) |
(1) Also includes curtailment triggered by the sale of the adhesives resins business which is included in "Other components of post-employment (benefit) cost, net" on the Unaudited Consolidated Statements of Earnings, Comprehensive Income and Retained Earnings. In 2022, subsequent to the adhesives resins divestiture, the Company retained pension liabilities of certain plan participants while the status of the participants changed in a Non-U.S. pension plan which triggered a curtailment. The Company recognized a curtailment gain of $7 million in second quarter and first six months 2022, which also triggered an interim MTM remeasurement of the impacted Non-U.S. pension plan's assets and liabilities that led to a gain of $3 million in second quarter and first six months 2022. Settlements are triggered in a plan when distributions exceed the sum of service cost and interest cost of the respective plan. Lump sum payments from a U.S. pension plan resulted in a plan settlement in second quarter and first six months 2022. The settlement itself was not material, but it triggered an interim MTM remeasurement of the impacted U.S. pension plan's assets and liabilities resulting in a $7 million loss in second quarter and first six months 2022.

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