14. Commitments

Operating Leases At December 31, 2015, the Company had $1.8 billion in long-term drilling rig commitments that satisfy operating lease criteria. The Company also had $329 million of various commitments under non-cancelable operating lease agreements for production platforms and equipment, buildings, facilities, compressors, and aircraft. These operating leases expire at various dates through 2026. Certain of these operating leases contain residual value guarantees at the end of the lease term, totaling $81 million at December 31, 2015. No liability has been accrued for residual value guarantees. In addition, these operating leases include options to purchase the leased property during or at the end of the lease term for the fair market value or other specified amount at that time. The following summarizes future minimum lease payments under operating leases at December 31, 2015:



millions
2016	$	806
2017	604
2018	352
2019	228
2020	86
Later years	41
Total future minimum lease payments	$	2,117

Anadarko has entered into various agreements to secure drilling rigs necessary to support the execution of its drilling plans over the next several years. The table of future minimum lease payments above includes $1.7 billion related to five offshore drilling vessels and $98 million related to certain contracts for U.S. onshore drilling rigs. Lease payments associated with the drilling of exploratory wells and development wells net of amounts billed to partners will initially be capitalized as a component of oil and gas properties, and either depreciated or impaired in future periods or written off as exploration expense.

Total rent expense, net of sublease income and amounts capitalized, amounted to $77 million in 2015, $85 million in 2014, and $119 million in 2013. Total rent expense includes contingent rent expense related to transportation and processing fees of $17 million in 2015, $22 million in 2014, and $24 million in 2013.

Other Commitments In the normal course of business, the Company enters into other contractual agreements for processing, treating, transportation, and storage of oil, natural gas, and NGLs as well as for other oil and gas activities. These agreements expire at various dates through 2036. At December 31, 2015, aggregate future payments under these contracts totaled $10.1 billion, of which $1.9 billion is expected to be paid in 2016, $1.7 billion in 2017, $1.3 billion in 2018, $1.2 billion in 2019, $1.1 billion in 2020, and $2.9 billion thereafter.