| **Accumulated Other Comprehensive Income/(Loss) (Tables)**               | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
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| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| Schedule of Accumulated other comprehensive income/(loss)                | Comprehensive income/(loss) and its components are presented in the Consolidated Statements of Comprehensive Income.  Changes in Accumulated other comprehensive income/(loss), net of tax, included in the Consolidated Statements of Changes in Stockholder's Equity, consisted of the following:(Millions of dollars)Foreign currency translation Derivative financial instruments Total      Balance at December 31, 2011$122 $(6) $116      Balance at December 31, 2012$184 $(8) $176      Balance at December 31, 2012$184 $(8) $176Other comprehensive income/(loss) before reclassifications(62) (1) (63)Amounts reclassified from accumulated other comprehensive income/(loss)— 4 4Other comprehensive income/(loss)(62) 3 (59)Balance at December 31, 2013$122 $(5) $117       |
| Reclassifications out of Accumulated other comprehensive income/(loss)   | The effect of the reclassifications out of Accumulated other comprehensive income/(loss) on the Consolidated Statements of Profit during the year ended December 31, 2013 was as follows:(Millions of dollars)    Classification of income (expense) 2013Foreign exchange contractsOther income (expense) $—Interest rate contractsInterest expense (6)Reclassifications before tax  (6)Tax (provision) benefit  2Total reclassifications from Accumulated other comprehensive income/(loss) $(4)                                                                                                                                                                                                                                                                                                                                                                                                             |

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| - Definition
Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss).
+ References
No definition available.
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| - Definition
Tabular disclosure of the components of accumulated other comprehensive income (loss).
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580
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