Eastman's obligations are summarized in the following table.



(Dollars in millions)	Payments Due for
Period	Debt Securities		Credit Facilities and Other		Interest Payable		Purchase Obligations		Operating Leases		Other Liabilities		Total
2019	$	—	$	243	$	210	$	275	$	63	$	250	$	1,041
2020	250		50		194		227		51		79		851
2021	482		—		189		136		40		92		939
2022	739		—		176		87		29		99		1,130
2023	855		—		157		77		18		96		1,203
2024 and beyond	3,549		—		1,553		2,046		47		1,010		8,205
Total	$	5,875	$	293	$	2,479	$	2,848	$	248	$	1,626	$	13,369

Estimated future payments of debt securities assumes the repayment of principal upon stated maturity, and actual amounts and the timing of such payments may differ materially due to repayment or other changes in the terms of such debt prior to maturity.

Eastman had various purchase obligations at December 31, 2018 totaling approximately $2.8 billion over a period of approximately 30 years for materials, supplies, and energy incident to the ordinary conduct of business. The Company also had various lease commitments for property and equipment under noncancelable operating leases totaling $248 million over a period of approximately 40 years. Of the total lease commitments, approximately 50 percent relate to real property, including office space, storage facilities, and land; approximately 40 percent relate to railcars; and approximately 10 percent relate to machinery and equipment, including computer and communications equipment and production equipment. Rental expense, net of sublease income, was $103 million, $94 million, and $90 million in 2018, 2017, and 2016, respectively.

Amounts in other liabilities represent the current estimated cash payments required to be made by the Company primarily for pension and other postretirement benefits, environmental loss contingency reserves, accrued compensation benefits, uncertain tax liabilities, one-time transition tax on deferred foreign income under the Tax Reform Act, and commodity and foreign exchange hedging in the periods indicated. Due to uncertainties in the timing of the effective settlement of tax positions with respect to taxing authorities, management is unable to determine the timing of payments related to uncertain tax liabilities and these amounts are included in the "2024 and beyond" line item.