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Commitments and Contingent Liabilities (Tables)
12 Months Ended
Dec. 31, 2012
Guarantees [Abstract]  
Guarantees
The maximum potential amount of future payments (undiscounted and without reduction for any amounts that may possibly be recovered under recourse or collateralized provisions) we could be required to make under the guarantees was as follows: 
(Millions of dollars)
 
 
 
 
 
 
 
 
2012
 
2011
 
2010
Guarantees with customers
 
$
151

 
$
159

 
$
139

Limited indemnity
 

 
11

 
17

Total guarantees
 
$
151

 
$
170

 
$
156