| **Derivative Financial Instruments and Risk Management**                | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               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| **Derivative Instruments and Hedging Activities Disclosure [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              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| Derivative Financial Instruments and Risk Management                    | Derivative Financial Instruments and Risk Management     Our earnings and cash flow are subject to fluctuations due to changes in foreign currency exchange rates and interest rates.  Our Risk Management Policy (policy) allows for the use of derivative financial instruments to prudently manage foreign currency exchange rate and interest rate exposures.  Our policy specifies that derivatives are not to be used for speculative purposes.  Derivatives that we use are primarily foreign currency forward, option and cross currency contracts and interest rate swaps.  Our derivative activities are subject to the management, direction and control of our senior financial officers.  Risk management practices, including the use of financial derivative instruments, are presented to our Board of Directors and the Audit Committee of the Caterpillar Inc. Board of Directors at least annually.All derivatives are recognized on the Consolidated Statements of Financial Position at their fair value.  On the date the derivative contract is entered into, the derivative instrument is (1) designated as a hedge of the fair value of a recognized asset or liability (fair value hedge), (2) designated as a hedge of a forecasted transaction or the cash flow variability associated with variable-rate debt (cash flow hedge) or (3) undesignated.  Changes in the fair value of a derivative that is qualified, designated and highly effective as a fair value hedge, along with the gain or loss on the hedged recognized asset or liability that is attributable to the hedged risk, are recorded in current earnings.  Changes in the fair value of a derivative that is qualified, designated and highly effective as a cash flow hedge are recorded in Accumulated other comprehensive income/(loss) (AOCI), to the extent effective, on the Consolidated Statements of Financial Position until they are reclassified to earnings in the same period or periods during which the hedged transaction affects earnings.  Changes in the fair value of undesignated derivative instruments and the ineffective portion of designated derivative instruments are reported in current earnings.  Cash flows from designated derivative financial instruments are classified within the same category as the item being hedged on the Consolidated Statements of Cash Flows.  Cash flows from undesignated derivative financial instruments are included in the investing category on the Consolidated Statements of Cash Flows. We formally document all relationships between hedging instruments and hedged items, as well as the risk-management objective and strategy for undertaking various hedge transactions.  This process includes linking all derivatives that are designated as fair value hedges to specific assets and liabilities on the Consolidated Statements of Financial Position and linking cash flow hedges to specific forecasted transactions or variability of cash flow. We also formally assess, both at the hedge’s inception and on an ongoing basis, whether the designated derivatives that are used in hedging transactions are highly effective in offsetting changes in fair value or cash flow of hedged items.  When a derivative is determined not to be highly effective as a hedge or the underlying hedged transaction is no longer probable, we discontinue hedge accounting prospectively, in accordance with derecognition criteria for hedge accounting.Foreign currency exchange rate riskWe have net foreign currency balance sheet positions and expected future transactions denominated in foreign currencies, thereby creating exposure to movements in foreign exchange rates.  In managing foreign currency risk, our objective is to minimize earnings volatility resulting from conversion and the remeasurement of net foreign currency balance sheet positions and expected future transactions denominated in foreign currencies.  Our policy allows the use of foreign currency forward, option and cross currency contracts to offset the risk of currency mismatch between our assets and liabilities and exchange rate risk associated with expected future transactions denominated in foreign currencies.  Substantially all such foreign currency forward, option and cross currency contracts are undesignated. Interest rate riskInterest rate movements create a degree of risk by affecting the amount of our interest payments and the value of our fixed-rate debt.  Our practice is to use interest rate swaps to manage our exposure to interest rate changes and, in some cases, to lower the cost of borrowed funds. We have a match-funding policy that addresses interest rate risk by aligning the interest rate profile (fixed or floating rate) of our debt portfolio with the interest rate profile of our receivables portfolio within predetermined ranges on an ongoing basis.  In connection with that policy, we use interest rate derivative instruments to modify the debt structure to match assets within the receivables portfolio.  This matched funding reduces the volatility of margins between interest-bearing assets and interest-bearing liabilities, regardless of which direction interest rates move.Our policy allows us to use fixed-to-floating, floating-to-fixed and floating-to-floating interest rate swaps to meet the match-funding objective.  We designate fixed-to-floating interest rate swaps as fair value hedges to protect debt against changes in fair value due to changes in the benchmark interest rate.  We designate most floating-to-fixed interest rate swaps as cash flow hedges to protect against the variability of cash flows due to changes in the benchmark interest rate.As of March 31, 2015, $1 million of deferred net losses, net of tax, included in equity (AOCI in the Consolidated Statements of Financial Position), related to our floating-to-fixed interest rate swaps, are expected to be reclassified to Interest expense over the next twelve months.  The actual amount recorded in Interest expense will vary based on interest rates at the time the hedged transactions impact earnings. We have, at certain times, liquidated fixed-to-floating interest rate swaps that resulted in deferred gains at the time of liquidation.  The deferred gains associated with these interest rate swaps are included in Long-term debt in the Consolidated Statements of Financial Position and are being amortized to Interest expense over the remaining term of the previously designated hedged item.The location and fair value of derivative instruments reported in the Consolidated Statements of Financial Position were as follows:(Millions of dollars)        Asset (Liability) Fair Value Consolidated Statements ofFinancial Position Location March 31, 2015 December 31, 2014Designated derivatives     Interest rate contractsOther assets $77 $79Interest rate contractsAccrued expenses (6) (8)   $71 $71Undesignated derivatives     Foreign exchange contractsOther assets $8 $5Foreign exchange contractsAccrued expenses (18) (15)Cross currency contractsOther assets 27 17   $17 $7      The total notional amounts of the derivative instruments were $4.75 billion and $5.25 billion as of March 31, 2015 and December 31, 2014, respectively.  The notional amounts of the derivative financial instruments do not represent amounts exchanged by the parties.  The amounts exchanged by the parties are calculated by reference to the notional amounts and by other terms of the derivatives, such as foreign currency exchange rates and interest rates.For the three months ended March 31, 2015 and 2014, the deferred gains (losses) recorded in AOCI on the Consolidated Statements of Changes in Stockholder’s Equity associated with our cash flow interest rate contract hedges were as follows:(Millions of dollars) Balance as of December 31, 2014, net of tax of $3$(5)Gains (losses) deferred during the period, net of tax of $11(Gains) losses reclassified to earnings, net of tax of $01Balance as of March 31, 2015, net of tax of $2$(3)  (Millions of dollars) Balance as of December 31, 2013, net of tax of $3$(5)Gains (losses) deferred during the period, net of tax of $0(2)(Gains) losses reclassified to earnings, net of tax of $01Balance as of March 31, 2014, net of tax of $3$(6)  The effect of derivatives designated as hedging instruments on the Consolidated Statements of Profit was as follows:Fair Value Hedges(Millions of dollars)   Three Months EndedMarch 31, 2015 Three Months EndedMarch 31, 2014 Classification Gains(Losses)onDerivatives Gains(Losses)onBorrowings  Gains(Losses)onDerivatives Gains (Losses)onBorrowingsInterest rate contractsOther income (expense) $(1) $1 $(13) $13          Cash Flow Hedges(Millions of dollars)   Three Months Ended March 31, 2015 Classification Reclassified from AOCIto Earnings(Effective Portion) Recognized in Earnings(Ineffective Portion)Interest rate contractsInterest expense $(1) $—Interest rate contractsOther income (expense) — —   $(1) $—         Three Months Ended March 31, 2014 Classification Reclassified from AOCIto Earnings(Effective Portion) Recognized in Earnings(Ineffective Portion)Interest rate contractsInterest expense $(1) $—Interest rate contractsOther income (expense) — —   $(1) $—      The effect of derivatives not designated as hedging instruments on the Consolidated Statements of Profit was as follows:Undesignated Derivatives     (Millions of dollars)  Three Months Ended March 31, Classification 2015 2014Foreign exchange contractsOther income (expense) $(38) $(1)Cross currency contractsOther income (expense) 10 (4)   $(28) $(5)      Balance sheet offsettingWe enter into International Swaps and Derivatives Association (ISDA) master netting agreements that permit the net settlement of amounts owed under their respective derivative contracts.  Under these master netting agreements, net settlement generally permits us or the counterparty to determine the net amount payable for contracts due on the same date and in the same currency for similar types of derivative transactions.  The master netting agreements generally also provide for net settlement of all outstanding contracts with a counterparty in the case of an event of default or a termination event.Collateral is generally not required of the counterparties or us under the master netting agreements.  As of March 31, 2015 and December 31, 2014, no cash collateral was received or pledged under the master netting agreements.    The effect of net settlement provisions of the master netting agreements on our derivative balances upon an event of default or a termination event was as follows: Offsetting of Derivative Assets and Liabilities    (Millions of dollars)      March 31, 2015 December 31, 2014Derivative Assets    Gross Amount of Recognized Assets $112 $101Gross Amounts Offset — —Net Amount of Assets(1) 112 101Gross Amounts Not Offset (14) (8)Net Amount $98 $93     Derivative Liabilities    Gross Amount of Recognized Liabilities $(24) $(23)Gross Amounts Offset — —Net Amount of Liabilities(1) (24) (23)Gross Amounts Not Offset 14 8Net Amount $(10) $(15)     (1) As presented in the Consolidated Statements of Financial Position. |

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| - Definition
The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.
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