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RETIREMENT PLANS | 6 Months Ended
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Jun. 30, 2018
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. Eastman provides a subsidy for pre-Medicare health care and dental benefits to eligible retirees hired prior to January 1, 2007 that will end on December 31, 2021. Company funding is also 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 derived for the year are determined. For additional information regarding retirement plans, see Note 10, "Retirement Plans", to the consolidated financial statements in Part II, Item 8 of the Company's 2017 Annual Report on Form 10-K. Components of net periodic benefit (credit) cost were as follows:
| Second Quarter
| Pension Plans |  | Other Postretirement Benefit Plans
| 2018 |  | 2017 |  | 2018 |  | 2017
(Dollars in millions) | U.S. |  | Non-U.S. |  | U.S. |  | Non-U.S. |  |  |  |
Service cost | $ | 8 |  |  | $ | 4 |  |  | $ | 9 |  |  | $ | 4 |  |  | $ | — |  |  | $ | 1 |
Interest cost | 17 |  |  | 5 |  |  | 16 |  |  | 4 |  |  | 5 |  |  | 6 |
Expected return on assets | (37 | ) |  | (10 | ) |  | (35 | ) |  | (9 | ) |  | — |  |  | (1 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |
Prior service credit, net | — |  |  | — |  |  | (1 | ) |  | — |  |  | (10 | ) |  | (10 | )
Net periodic benefit (credit) cost | $ | (12 | ) |  | $ | (1 | ) |  | $ | (11 | ) |  | $ | (1 | ) |  | $ | (5 | ) |  | $ | (4 | )
| First Six Months
| Pension Plans |  | Other Postretirement Benefit Plans
| 2018 |  | 2017 |  | 2018 |  | 2017
(Dollars in millions) | U.S. |  | Non-U.S. |  | U.S. |  | Non-U.S. |  |  |  |
Service cost | $ | 17 |  |  | $ | 8 |  |  | $ | 18 |  |  | $ | 7 |  |  | $ | — |  |  | $ | 2 |
Interest cost | 34 |  |  | 10 |  |  | 33 |  |  | 9 |  |  | 11 |  |  | 12 |
Expected return on assets | (74 | ) |  | (19 | ) |  | (70 | ) |  | (17 | ) |  | (2 | ) |  | (3 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |
Prior service credit, net | — |  |  | — |  |  | (2 | ) |  | — |  |  | (20 | ) |  | (20 | )
Net periodic benefit (credit) cost | $ | (23 | ) |  | $ | (1 | ) |  | $ | (21 | ) |  | $ | (1 | ) |  | $ | (11 | ) |  | $ | (9 | )
On January 1, 2018, the Company adopted ASU 2017-07 resulting in non-service cost components of the net periodic pension and other postretirement benefit plans being presented in "Other components of post-employment (benefit) cost, net" line item of the Unaudited Consolidated Statement of Earnings, Comprehensive Income and Retained Earnings. See Note 1, "Significant Accounting Policies", for additional information.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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