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Leases
12 Months Ended
Dec. 31, 2012
Leases [Abstract]  
Leases
Leases
We lease office facilities, sales and service offices, equipment and other properties under operating lease agreements extending from three to eight years. Certain leases require us to pay property taxes, insurance and routine maintenance and include renewal options and escalation clauses. Rental expense was $100 million, $117 million and $118 million in 2012, 2011 and 2010, respectively. Future minimum lease payments under non-cancelable operating leases at December 31, 2012 were as follows:
Years ending December 31,
 
2013
$
90,936

2014
69,945

2015
49,835

2016
32,355

2017
18,647

Thereafter
22,360

Total minimum lease payments
$
284,078