| **Fair Value Disclosures (Tables)**                                                 | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
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| **Fair Value Disclosures [Abstract]**                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| Assets and liabilities measured at fair value                                       | Assets and liabilities measured on a recurring basis at fair value included in our Consolidated Statements of Financial Position are summarized below: (Millions of dollars)           December 31, 2012  Level 1 Level 2 Level 3 Total Assets/Liabilities,at Fair ValueAssets          Derivative financial instruments, net $— $223 $— $223Total Assets $— $223 $— $223Liabilities        Guarantees $— $— $2 $2Total Liabilities $— $— $2 $2           December 31, 2011  Level 1 Level 2 Level 3 Total Assets/Liabilities,at Fair ValueAssets          Derivative financial instruments, net $— $232 $— $232Total Assets $— $232 $— $232Liabilities        Guarantees $— $— $2 $2Total Liabilities $— $— $2 $2           December 31, 2010  Level 1 Level 2 Level 3 Total Assets/Liabilities,at Fair ValueAssets        Derivative financial instruments, net $— $189 $— $189Total Assets $— $189 $— $189Liabilities        Guarantees $— $— $3 $3Total Liabilities $— $— $3 $3                                                                                              |
| Roll-forwards of assets and liabilities measured at fair value using Level 3 inputs | Below are roll-forwards of assets and liabilities measured at fair value using Level 3 inputs for the years ended December 31, 2012, 2011 and 2010.  These instruments were valued using pricing models that, in management’s judgment, reflect the assumptions of a marketplace participant.(Millions of dollars)   SecuritizedRetainedInterests GuaranteesBalance as of December 31, 2009 $102 $4Adjustment to adopt consolidation of variable-interest entities (102) —Issuance of guarantees — 7Expiration of guarantees — (8)Balance as of December 31, 2010 $— $3Issuance of guarantees — 4Expiration of guarantees — (5)Balance as of December 31, 2011 $— $2Issuance of guarantees — 2Expiration of guarantees — (2)Balance as of December 31, 2012 $— $2                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| Fair values of financial instruments                                                | Please refer to the table below for the fair values of our financial instruments. (Millions of dollars) 2012 2011 2010    Carrying Amount Fair Value Carrying Amount Fair Value Carrying Amount Fair ValueFair Value LevelsReferenceCash and cash equivalents $2,080 $2,080 $1,176 $1,176 $1,676 $1,6761 Foreign currency contracts:              In a receivable position $10 $10 $7 $7 $6 $62Note 8In a payable position $(5) $(5) $(16) $(16) $(9) $(9)2Note 8Cross currency contracts $(1) $(1) $— $— $— $—2Note 8Finance receivables, net (excluding finance leases(1)) $20,189 $20,079 $17,431 $17,172 $15,444 $15,3112Note 2Restricted cash and cash equivalents(2) $19 $19 $64 $64 $91 $911 Short-term borrowings $(4,651) $(4,651) $(3,895) $(3,895) $(3,852) $(3,852)1Note 6Long-term debt $(25,077) $(26,063) $(21,631) $(22,674) $(19,362) $(20,364)2Note 7Interest rate swaps:              In a net receivable position $228 $228 $248 $248 $211 $2112Note 8In a net payable position $(9) $(9) $(7) $(7) $(19) $(19)2Note 8Guarantees $(2) $(2) $(2) $(2) $(3) $(3)3Note 9               (1) As of December 31, 2012, 2011 and 2010, represents finance leases with a net carrying value of $7,968 million, $7,325 million and $7,299 million, respectively.(2 ) Included in Other assets in the Consolidated Statements of Financial Position. |

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| - Definition
Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value.
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| - Definition
Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability.
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| - Definition
Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).
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