| **Fair Value Measurements (Tables)**                                                | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
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| **Fair Value Disclosures [Abstract]**                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Assets and liabilities measured at fair value                                       | (Millions of dollars)        June 30, 2012 Level 1 Level 2 Level 3 Total Assets/Liabilities,at Fair ValueAssets       Derivative financial instruments, net$— $235 $— $235Total Assets$— $235 $— $235Liabilities       Guarantees$— $— $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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| Roll-forwards of assets and liabilities measured at fair value using Level 3 inputs | (Millions of dollars)GuaranteesBalance as of December 31, 2011$2Issuance of guarantees1Expiration of guarantees(1)Balance as of June 30, 2012$2  (Millions of dollars)GuaranteesBalance as of December 31, 2010$3Issuance of guarantees1Expiration of guarantees(2)Balance as of June 30, 2011$2                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Fair values of financial instruments                                                | (Millions of dollars)June 30, 2012 December 31, 2011     CarryingAmount FairValue CarryingAmount FairValue Fair ValueLevels ReferenceCash and cash equivalents$2,210 $2,210 $1,176 $1,176 1  Foreign currency contracts:           In a receivable position$11 $11 $7 $7 2 Note 5In a payable position$(11) $(11) $(16) $(16) 2 Note 5Finance receivables, net (excluding finance leases(1))$18,710 $18,574 $17,431 $17,172 2 Note 4Restricted cash and cash equivalents(2)$27 $27 $64 $64 1  Short-term borrowings$(4,455) $(4,455) $(3,895) $(3,895) 1  Long-term debt$(23,831) $(24,859) $(21,631) $(22,674) 2  Interest rate swaps:           In a net receivable position$244 $244 $248 $248 2 Note 5In a net payable position$(9) $(9) $(7) $(7) 2 Note 5Guarantees$(2) $(2) $(2) $(2) 3 Note 7            (1)As of June 30, 2012 and December 31, 2011, represents finance leases with a net carrying value of $7,613 million and $7,325 million, respectively.(2) Included in Other assets in the Consolidated Statements of Financial Position. |

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| - Definition
This element represents, for the fair value measurement of assets and liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period 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 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, issuances, 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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No definition available.
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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 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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