20. Leased Assets

We and certain of our subsidiaries lease drilling rigs, office space and other assets for varying periods under contractual obligations accounted for as operating leases. Operating lease expenses for drilling rigs used to drill development wells and successful exploration wells are capitalized. At December 31, 2016, future minimum rental payments applicable to non‑cancelable operating leases with remaining terms of one year or more (other than oil and gas property leases) are as follows (in millions):

2017	$	376
2018	375
2019	351
2020	124
2021	67
Remaining years	338
Total Minimum Lease Payments		1,631
Less: Income from subleases	78
Net Minimum Lease Payments	$	1,553

Rental expense was as follows:

	2016		2015		2014
	(In millions)
Total rental expense	$	106	$	167	$	248
Less: Income from subleases	5		10		17
Net Rental Expense	$	101	$	157	$	231