Lease Commitments

12 Months Ended

Dec. 31, 2017

Leases [Abstract]

Lease Commitments

Lease Commitments

We are committed under long-term lease agreements, which expire on various dates through 2067, for equipment, lines of road and other property.  The following amounts do not include payments to CRC under the Shared Assets Areas agreements (Note 5).  Future minimum lease payments and operating lease expense are as follows:

Future Minimum Lease Payments

	Operating Leases
	($ in millions)
2018	$	69
2019	66
2020	60
2021	55
2022	51
2023 and subsequent years	359
Total	$	660

Operating Lease Expense

	2017		2016		2015
	($ in millions)
Minimum rents	$	90	$	98	$	111
Contingent rents	79		73		84
Total	$	169	$	171	$	195

Contingent rents are primarily comprised of usage-based rent paid to other railroads for joint facility operations.