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Other income (expense) (Tables)
 12 Months Ended
Dec. 31, 2012
Other Income and Expenses [Abstract]  
Other income (expense)
 
 
Years ended December 31,
(Millions of dollars)
 
2012
 
2011
 
2010
Investment and interest income
 
$
82

 
$
85

 
$
86

Foreign exchange gains (losses) 1 
 
(116
)
 
21

 
(55
)
License fee income
 
99

 
80

 
54

Gains (losses) on sale of securities and affiliated companies
 
4

 
17

 
9

Impairment of available-for-sale securities
 
(2
)
 
(5
)
 
(3
)
Miscellaneous income (loss)
 
63

 
(230
)
2 
39

 
 
$
130

 
$
(32
)
 
$
130

 
1 Includes gains (losses) from foreign exchange derivative contracts.  See Note 3 for further details.
2 Miscellaneous income (loss) in 2011 includes forward starting swap costs of $149 million (see Note 3) and bridge financing
costs of $54 million (see Note 23), both related to the acquisition of Bucyrus.