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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Accumulated Other Comprehensive Income/(Loss)
Accumulated other comprehensive income/(loss), net of tax, included in the Consolidated Statements of Changes in Stockholder's Equity, consisted of the following as of:
(Millions of dollars)
 
 
December 31,
 
 
2012
 
2011
 
2010
Foreign currency translation
 
$
184

 
$
122

 
$
231

Derivative financial instruments
 
(8
)
 
(6
)
 
(14
)
Total Accumulated other comprehensive income/(loss)
 
$
176

 
$
116

 
$
217