The following summarizes our principal contractual commitments, excluding open orders for purchases that support normal operations and are generally cancellable, as of December 31, 2017 (in millions):



	Year Ended December 31,
	2018		2019		2020		2021		2022		Thereafter		Total
Debt principal and interest	$	967	$	2,234	$	2,111	$	1,834	$	2,050	$	31,799	$	40,995
Capital lease obligations, including interest (1)	6,084		4,788		2,590		557		262		530		14,811
Finance lease obligations, including interest (2)	445		460		466		476		472		3,946		6,265
Operating leases	2,427		2,376		2,258		2,039		1,813		11,935		22,848
Unconditional purchase obligations (3)	3,527		3,561		3,195		3,039		2,922		7,956		24,200
Other commitments (4) (5)	1,584		1,016		733		571		438		4,744		9,086
Total commitments	$	15,034	$	14,435	$	11,353	$	8,516	$	7,957	$	60,910	$	118,205

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(1)	Excluding interest, current capital lease obligations of $4.0 billion and $5.8 billion are recorded within “Accrued expenses and other” as of December 31, 2016 and 2017, and $5.1 billion and $8.4 billion are recorded within “Other long-term liabilities” as of December 31, 2016 and 2017.


(2)	Excluding interest, current finance lease obligations of $144 million and $282 million are recorded within “Accrued expenses and other” as of December 31, 2016 and 2017, and $2.4 billion and $4.7 billion are recorded within “Other long-term liabilities” as of December 31, 2016 and 2017.

(3)

Includes unconditional purchase obligations related to certain products offered in our Whole Foods Market stores and long-term agreements to acquire and license digital media content that are not reflected on the consolidated balance sheets. For those digital media content agreements with variable terms, we do not estimate the total obligation beyond any minimum quantities and/or pricing as of the reporting date. Purchase obligations associated with renewal provisions solely at the option of the content provider are included to the extent such commitments are fixed or a minimum amount is specified.


(4)	Includes the estimated timing and amounts of payments for rent and tenant improvements associated with build-to-suit lease arrangements and equipment lease arrangements that have not been placed in service and digital media content liabilities associated with long-term digital media content assets with initial terms greater than one year.


(5)	Excludes $2.3 billion of accrued tax contingencies for which we cannot make a reasonably reliable estimate of the amount and period of payment, if any.