|**Derivative Financial Instruments and Risk Management (Tables)**                                                       | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
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|**Derivative Instruments and Hedging Activities Disclosure [Abstract]**                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Location and fair value of derivative instruments reported in the Consolidated Statements of Financial Position         | The location and fair value of derivative instruments reported in the Consolidated Statements of Financial Position were as follows:(Millions of dollars)Asset (Liability) Fair ValueDecember 31,Consolidated Statements ofFinancial Position Location201220112010Designated derivativesInterest rate contractsOther assets$226$248$211Interest rate contractsAccrued expenses(8)(6)(18)$218$242$193Undesignated derivativesForeign exchange contractsOther assets$10$7$6Foreign exchange contractsAccrued expenses(5)(16)(9)Cross currency contractsAccrued expenses(1)——Interest rate contractsOther assets2——Interest rate contractsAccrued expenses(1)(1)(1)$5$(10)$(4)                                                                                                                                                                                                                                                                                                                                        
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|(Millions of dollars)                                                                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
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|Designated derivatives                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Interest rate contracts                                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Interest rate contracts                                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
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|Undesignated derivatives                                                                                                |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Foreign exchange contracts                                                                                              |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Foreign exchange contracts                                                                                              |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Cross currency contracts                                                                                                |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Interest rate contracts                                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Interest rate contracts                                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
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|Deferred gains (losses) recorded in AOCI on the Consolidated Statements of Changes in Stockholder's Equity              | For the years endedDecember 31, 2012,2011and2010, the deferred gains (losses) recorded in AOCI on the Consolidated Statements of Changes in Stockholder’s Equity associated with our cash flow interest rate contract hedges were as follows:(Millions of dollars)Balance as of December 31, 2011, net of tax of $3$(6)Gains (losses) deferred during the year, net of tax of $-1(Gains) losses reclassified to earnings, net of tax of$(1)(3)Balance as of December 31, 2012, net of tax of $4$(8)(Millions of dollars)Balance as of December 31, 2010, net of tax of $6$(14)Gains (losses) deferred during the year, net of tax of $-(1)(Gains) losses reclassified to earnings, net of tax of $39Balance as of December 31, 2011, net of tax of $3$(6)(Millions of dollars)Balance as of December 31, 2009, net of tax of $21$(41)Gains (losses) deferred during the year, net of tax of $1(6)(Gains) losses reclassified to earnings, net of tax of $1633Balance as of December 31, 2010, net of tax of $6$(14)
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|(Millions of dollars)                                                                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Balance as of December 31, 2011, net of tax of $3                                                                       | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Gains (losses) deferred during the year, net of tax of $-                                                               | 1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|(Gains) losses reclassified to earnings, net of tax of$(1)                                                              | (3                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Balance as of December 31, 2012, net of tax of $4                                                                       | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
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|(Millions of dollars)                                                                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Balance as of December 31, 2010, net of tax of $6                                                                       | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Gains (losses) deferred during the year, net of tax of $-                                                               | (1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|(Gains) losses reclassified to earnings, net of tax of $3                                                               | 9                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Balance as of December 31, 2011, net of tax of $3                                                                       | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
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|(Millions of dollars)                                                                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Balance as of December 31, 2009, net of tax of $21                                                                      | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Gains (losses) deferred during the year, net of tax of $1                                                               | (6                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|(Gains) losses reclassified to earnings, net of tax of $16                                                              | 33                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Balance as of December 31, 2010, net of tax of $6                                                                       | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
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|Schedule of effect of derivatives designated as fair value hedging instruments in the Consolidated Statements of Profit | The effect of derivatives designated as hedging instruments on the Consolidated Statements of Profit was as follows:Fair Value Hedges(Millions of dollars)Year Ended December 31, 2012ClassificationGains (Losses)on DerivativesGains (Losses)on BorrowingsInterest rate contractsOther income (expense)$(20)$36Year Ended December 31, 2011ClassificationGains (Losses)on DerivativesGains (Losses)on BorrowingsInterest rate contractsOther income (expense)$39$(44)Year Ended December 31, 2010ClassificationGains (Losses)on DerivativesGains (Losses)on BorrowingsInterest rate contractsOther income (expense)$107$(98)                                                                                                                                                                                                                                                                                                                                                                                      
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|Fair Value Hedges                                                                                                      
|(Millions of dollars)                                                                                                  
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|Interest rate contracts                                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
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|Interest rate contracts                                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
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|Interest rate contracts                                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
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|Schedule of effect of derivatives designated as cash flow hedging instruments in the Consolidated Statements of Profit  | Cash Flow Hedges(Millions of dollars)Year Ended December 31, 2012Classification ofGains (Losses)Reclassified from AOCIto Earnings(Effective Portion)Recognized in Earnings(Ineffective Portion)Interest rate contractsInterest expense$4$—Interest rate contractsOther income (expense)—(1)$4$(1)Year Ended December 31, 2011Classification ofGains (Losses)Reclassified from AOCIto Earnings(Effective Portion)Recognized in Earnings(Ineffective Portion)Interest rate contractsInterest expense$(12)$—Interest rate contractsOther income (expense)—(2)$(12)$(2)Year Ended December 31, 2010Classification ofGains (Losses)Reclassified from AOCIto Earnings(Effective Portion)Recognized in Earnings(Ineffective Portion)Interest rate contractsInterest expense$(49)$—Interest rate contractsOther income (expense)—(1)$(49)$(1)                                                                                                                                                                              
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|Cash Flow Hedges                                                                                                       
|(Millions of dollars)                                                                                                  
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|Interest rate contracts                                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Interest rate contracts                                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
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|Interest rate contracts                                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Interest rate contracts                                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
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|Interest rate contracts                                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Interest rate contracts                                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
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|Schedule of effect of derivatives not designated as hedging instruments on the Consolidated Statements of Profit        | The effect of derivatives not designated as hedging instruments on the Consolidated Statements of Profit was as follows for the years ended December 31:Undesignated Derivatives(Millions of dollars)Classification ofGains (Losses)201220112010Foreign exchange contractsOther income (expense)$7$(15)$16Cross currency contractsOther income (expense)(1)——Interest rate contractsOther income (expense)——2$6$(15)$18                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
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|Undesignated Derivatives                                                                                                |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|(Millions of dollars)                                                                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
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|Foreign exchange contracts                                                                                              |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Cross currency contracts                                                                                                |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Interest rate contracts                                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
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