| **Fair Value Disclosures**            | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                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| **Fair Value Disclosures [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 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| Fair Value Disclosures                | FAIR VALUE DISCLOSURES A.  Fair Value Measurements The 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 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         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     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 $117 million, $96 million and $58 million as of December 31, 2012, 2011 and 2010, respectively.   B.  Fair Values of Financial Instruments In 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) 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
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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