The obligations described above, debt repayment obligations, and credit facilities and commercial paper borrowings, 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⁽¹⁾		Total
2017	$	—	$	283	$	229	$	211	$	62	$	239	$	1,024
2018	—		37		231		208		49		82		607
2019	249		250		227		186		36		74		1,022
2020	796		30		199		186		29		88		1,328
2021	184		232		185		160		24		84		869
2022 and beyond	4,533		—		1,788		2,052		65		1,074		9,512
Total	$	5,762	$	832	$	2,859	$	3,003	$	265	$	1,641	$	14,362

⁽¹⁾

Amounts 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, 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 "2022 and beyond" line item.