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Operating leases
12 Months Ended
Dec. 31, 2012
Leases [Abstract]  
Operating leases
Operating leases
 
We lease certain computer and communications equipment, transportation equipment and other property through operating leases. Total rental expense for operating leases was $474 million, $429 million, and $359 million for 2012, 2011 and 2010, respectively.
 
Minimum payments for operating leases having initial or remaining non-cancelable terms in excess of one year are:
  
Years ended December 31,
(Millions of dollars)
2013
 
2014
 
2015
 
2016
 
2017
 
Thereafter
 
Total
$
254

 
$
193

 
$
139

 
$
104

 
$
74

 
$
239

 
$
1,003