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INCOME TAXES
 6 Months Ended
Jun. 30, 2021
Income Tax Disclosure [Abstract]  
PROVISION FOR INCOME TAXES INCOME TAXES
 
Second Quarter (1)
First Six Months
(Dollars in millions)2021202020212020
$%$%$%$%
Provision for income taxes and tax rate$37 — $(31)— $99 44 %$25 8 %
(1)The calculated effective tax rates are greater than 100 percent or less than zero percent.

Second quarter and first six months 2021 effective tax rates include a $21 million decrease to the provision for income taxes from the revaluation of deferred tax liabilities as a result of business held for sale classification of certain assets. Second quarter and first six months 2020 effective tax rates included a $19 million decrease to the provision for income taxes as a result of a decrease in unrecognized tax positions and a $7 million decrease to the provision for income taxes related to estimated adjustments to certain prior year tax returns.

At June 30, 2021 and December 31, 2020, Eastman had $256 million and $257 million, respectively, in unrecognized tax benefits. At June 30, 2021, it is expected that, as a result of the resolution of federal, state, and foreign examinations and appeals, and the expiration of various statutes of limitation, the total amounts of unrecognized tax benefits will decrease by $65 million during second half 2021.

Income tax incentives, in the form of tax holidays, have been granted to the Company in certain jurisdictions to attract investment and encourage industrial development. The expiration of these tax holidays varies by country. The tax holidays are conditional on the Company meeting certain requirements, including employment and investment thresholds; determination of compliance with these conditions may be subject to challenge by tax authorities in those jurisdictions. No individual tax holiday had a material impact to the Company's earnings in second quarter or first six months 2021 or 2020.