21.

COMMITMENTS

The Company’s commitments as of December 31, 2015 were as follows:


In millions of U.S. dollars	Total		2016		2017		2018		2019		2020		Thereafter
Operating leases		191		48		35		24		15		13		56
Purchase obligations		468		377		65		23		3		—		—
of which:
Equipment purchase		149		149		—		—		—		—		—
Foundry purchase		101		101		—		—		—		—		—
Software, design, technologies and licenses		218		127		65		23		3		—		—
Other obligations		431		206		179		35		6		5		—

Total		1,090		631		279		82		24		18		56

Operating leases are mainly related to building and equipment leases. The amount disclosed is composed of minimum payments for future leases from 2016 to 2020 and thereafter. The Company leases land, buildings, plants and equipment under operating leases that expire at various dates under non-cancellable lease agreements. Operating lease expense was $56 million for the year ended December 31, 2015, $66 million for the year ended December 31, 2014 and $83 million for the year ended December 31, 2013.

Purchase obligations are primarily comprised of purchase commitments for equipment, for outsourced foundry wafers and for software licenses.

Other obligations primarily relate to firm contractual commitments with respect to partnership and cooperation agreements and other service agreements.