LEASES

The following table presents our future minimum lease obligations for which we are the primary obligor as of year-end 2018:



($ in millions)	Operating Leases		Capital Leases
2019	$	171	$	13
2020	170		13
2021	145		13
2022	153		13
2023	139		13
Thereafter	1,295		165
Total minimum lease payments where we are the primary obligor	$	2,073	$	230
Less: Amount representing interest			67
Present value of minimum lease payments			$	163

Most leases have initial terms of up to 20 years, contain one or more renewals at our option, generally for five- or 10-year periods, and generally contain fixed and variable components. The variable components of leases of land or building facilities are primarily based on operating performance of the leased property.

The following table details the composition of rent expense for operating leases for the last three years:



($ in millions)	2018		2017		2016
Minimum rentals	$	192	$	194	$	150
Additional rentals	83		85		67
	$	275	$	279	$	217