| **Fair Value Measurements**           | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 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| **Fair Value Disclosures [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                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| Fair Value Measurements               | Fair Value MeasurementsA.Fair Value MeasurementsThe guidance on fair value measurements defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants.  This guidance also specifies a fair value hierarchy based upon the observability of inputs used in valuation techniques.  Observable inputs (highest level) reflect market data obtained from independent sources, while unobservable inputs (lowest level) reflect internally developed market assumptions.  In accordance with this guidance, fair value measurements are classified under the following hierarchy: •Level 1 – Quoted prices for identical instruments in active markets.•Level 2 – Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs or significant value-drivers are observable in active markets.•Level 3 – Model-derived valuations in which one or more significant inputs or significant value-drivers are unobservable.When available, we use quoted market prices to determine fair value, and we classify such measurements within Level 1.  In some cases where market prices are not available, we make use of observable market-based inputs to calculate fair value, in which case the measurements are classified within Level 2.  If quoted or observable market prices are not available, fair value is based upon internally developed models that use, where possible, current market-based parameters such as interest rates, yield curves and currency rates.  These measurements are classified within Level 3.Fair value measurements are classified according to the lowest level input or value-driver that is significant to the valuation.  A measurement may therefore be classified within Level 3 even though there may be significant inputs that are readily observable.Fair value measurement includes the consideration of nonperformance risk.  Nonperformance risk refers to the risk that an obligation (either by a counterparty or us) will not be fulfilled.  For financial assets traded in an active market (Level 1), the nonperformance risk is included in the market price.  For certain other financial assets and liabilities (Level 2 and 3), our fair value calculations have been adjusted accordingly. Derivative financial instrumentsThe fair value of interest rate swap derivatives is primarily based on standard industry accepted models that utilize the appropriate market-based forward swap curves and zero-coupon interest rates to determine discounted cash flows.  The fair value of foreign currency forward and cross currency contracts is based on a standard industry accepted valuation model that discounts cash flows resulting from the differential between the contract price and the market-based forward rate. GuaranteesThe fair value of guarantees is based on our estimate of the premium a market participant would require to issue the same guarantee in a stand-alone, arms-length transaction with an unrelated party.  If quoted or observable market prices are not available, fair value is based upon internally developed models that utilize current market-based assumptions.Assets and liabilities measured on a recurring basis at fair value included in our Consolidated Statements of Financial Position as of March 31, 2013 and December 31, 2012 are summarized below:(Millions of dollars)        March 31, 2013 Level 1 Level 2 Level 3 Total Assets/Liabilities,at Fair ValueAssets       Derivative financial instruments, net$— $179 $— $179Total Assets$— $179 $— $179Liabilities       Guarantees$— $— $2 $2Total Liabilities$— $— $2 $2         December 31, 2012 Level 1 Level 2 Level 3 Total Assets/Liabilities,at Fair ValueAssets         Derivative financial instruments, net$— $223 $— $223Total Assets$— $223 $— $223Liabilities       Guarantees$— $— $2 $2Total Liabilities$— $— $2 $2        Below are roll-forwards of assets and liabilities measured at fair value using Level 3 inputs for the three months ended March 31, 2013 and 2012.  These instruments were valued using pricing models that, in management’s judgment, reflect the assumptions of a marketplace participant.(Millions of dollars)GuaranteesBalance as of December 31, 2012$2Issuance of guarantees1Expiration of guarantees(1)Balance as of March 31, 2013$2  (Millions of dollars)GuaranteesBalance as of December 31, 2011$2Issuance of guarantees—Expiration of guarantees—Balance as of March 31, 2012$2  Impaired loansIn addition to the amounts above, our impaired loans are subject to measurement at fair value on a nonrecurring basis.  A loan is considered impaired when management determines that collection of contractual amounts due is not probable.  In these cases, an Allowance for credit losses may be established based primarily on the fair value of associated collateral.  As the collateral's fair value is based on observable market prices and/or current appraised values, the impaired loans are classified as Level 2 measurements.  We had impaired loans carried at the fair value of the underlying collateral value of $190 million and $161 million as of March 31, 2013 and December 31, 2012, respectively.  B.Fair Values of Financial InstrumentsIn addition to the methods and assumptions we use to record the fair value of financial instruments as discussed in the Fair Value Measurements section above, we used the following methods and assumptions to estimate the fair value of our financial instruments.  Cash and cash equivalents – carrying amount approximated fair value. Finance receivables, net – fair value was estimated by discounting the future cash flows using current rates representative of receivables with similar remaining maturities. Restricted cash and cash equivalents – carrying amount approximated fair value. Short-term borrowings – carrying amount approximated fair value. Long-term debt – fair value for fixed and floating-rate debt was estimated based on quoted market prices.Please refer to the table below for the fair values of our financial instruments.(Millions of dollars)March 31, 2013 December 31, 2012     CarryingAmount FairValue CarryingAmount FairValue Fair ValueLevels ReferenceCash and cash equivalents$2,256 $2,256 $2,080 $2,080 1  Foreign currency contracts:           In a receivable position$9 $9 $10 $10 2 Note 5In a payable position$(16) $(16) $(5) $(5) 2 Note 5Cross currency contracts$(4) $(4) $(1) $(1) 2 Note 5Finance receivables, net (excluding finance leases(1))$20,343 $20,184 $20,189 $20,079 2 Note 4Restricted cash and cash equivalents(2)$39 $39 $19 $19 1  Short-term borrowings$(4,315) $(4,315) $(4,651) $(4,651) 1  Long-term debt$(25,725) $(26,675) $(25,077) $(26,063) 2  Interest rate swaps:           In a net receivable position$199 $199 $228 $228 2 Note 5In a net payable position$(9) $(9) $(9) $(9) 2 Note 5Guarantees$(2) $(2) $(2) $(2) 3 Note 7            (1)As of March 31, 2013 and December 31, 2012, represents finance leases with a net carrying value of $8,008 million and $7,968 million, respectively.(2) Included in Other assets in the Consolidated Statements of Financial Position. |

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| - Definition
The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.
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