(18)Commitments and Contingencies

Operating Leases

Liberty leases business offices, has entered into satellite transponder lease agreements and uses certain equipment under lease arrangements. Rental expense under such arrangements amounted to $39 million, $47 million and $50 million for the years ended December 31, 2015, 2014 and 2013, respectively.

A summary of future minimum lease payments under noncancelable operating leases and build to suit leases as of December 31, 2015 follows (amounts in millions):

It is expected that in the normal course of business, leases that expire generally will be renewed or replaced by leases on other properties; thus, it is anticipated that future lease commitments will not be less than the amount shown for 2015.

Litigation

Liberty has contingent liabilities related to legal and tax proceedings and other matters arising in the ordinary course of business. Although it is reasonably possible Liberty may incur losses upon conclusion of such matters, an estimate of any loss or range of loss cannot be made. In the opinion of management, it is expected that amounts, if any, which may be required to satisfy such contingencies will not be material in relation to the accompanying consolidated financial statements.