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Lease Commitments (Tables)
 12 Months Ended
Dec. 31, 2012
Schedule of Future Minimum Rental Commitments Under Non-Cancelable Operating Leases

The future minimum rental commitments under non-cancelable operating leases follow:
(MILLIONS OF DOLLARS)
 
2013

 
2014

 
2015

 
2016

 
2017

 
After 2017

Lease commitments
 
$
184

 
$
162

 
$
132

 
$
85

 
$
74

 
$
618