| **Fair Value Measurements (Tables)**  | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
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| **Fair Value Disclosures [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| Fair values of financial instruments  | Please refer to the table below for the fair values of our financial instruments.(Millions of dollars)June 30, 2016 December 31, 2015     CarryingAmount FairValue CarryingAmount FairValue Fair ValueLevels ReferenceCash and cash equivalents$1,075 $1,075 $1,016 $1,016 1  Foreign currency contracts:           In a receivable position$6 $6 $3 $3 2 Note 5In a payable position$(9) $(9) $(6) $(6) 2 Note 5Cross currency contracts:           In a receivable position$34 $34 $37 $37 2 Note 5In a payable position$(2) $(2) $— $— 2 Note 5Investment in equity securities$2 $2 $— $— 1  Finance receivables, net (excluding finance leases(1))$20,906 $20,901 $20,935 $20,925 3 Note 4Restricted cash and cash equivalents(2)$11 $11 $18 $18 1  Short-term borrowings$(7,220) $(7,220) $(6,958) $(6,958) 1  Long-term debt$(21,351) $(21,954) $(21,569) $(21,904) 2  Interest rate swaps:           In a net receivable position$50 $50 $51 $51 2 Note 5In a net payable position$(4) $(4) $(4) $(4) 2 Note 5Guarantees$(1) $(1) $— $— 3 Note 7            (1)As of June 30, 2016 and December 31, 2015, represents finance leases with a net carrying value of $6.42 billion and $6.45 billion, 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, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.
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No definition available.
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