| **Consolidated Statements of Changes in Stockholder's Equity (USD $)In Millions, unless otherwise specified** | Total                                                                                               | Common stock                                                                                                                                          | Additional paid-in capital                                                                                                                                      | Retained earnings                                                                                                                                            | Accumulated other comprehensive income/(loss)                                                                                                                                                 | Noncontrolling interests                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Balance at Dec. 31, 2013                                                                                      | $ 3,991us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest               | $ 745us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember | $ 2us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember | $ 3,004us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember | $ 117us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                 | $ 123us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_NoncontrollingInterestMember               |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**                                                |                                                                                                |                                                                                                                                                  |                                                                                                                                                            |                                                                                                                                                         |                                                                                                                                                                                          |                                                                                                                                                                           |
| Profit of consolidated companies                                                                              | 134us-gaap_ProfitLoss                                                                               |                                                                                                                                                  |                                                                                                                                                            | 131us-gaap_ProfitLoss/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                                                 |                                                                                                                                                                                          | 3us-gaap_ProfitLoss/ us-gaap_StatementEquityComponentsAxis= us-gaap_NoncontrollingInterestMember                                                                               |
| Dividend paid to Caterpillar                                                                                  | 0us-gaap_PaymentsOfDividends                                                                        |                                                                                                                                                  |                                                                                                                                                            |                                                                                                                                                         |                                                                                                                                                                                          |                                                                                                                                                                           |
| Foreign currency translation, net of tax                                                                      | 4us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax     |                                                                                                                                                  |                                                                                                                                                            |                                                                                                                                                         | 5us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember     | (1)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax/ us-gaap_StatementEquityComponentsAxis= us-gaap_NoncontrollingInterestMember |
| Derivative financial instruments, net of tax                                                                  | (1)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax                        |                                                                                                                                                  |                                                                                                                                                            |                                                                                                                                                         | (1)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                        |                                                                                                                                                                           |
| Balance at Mar. 31, 2014                                                                                      | 4,128us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest                 | 745us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember   | 2us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember   | 3,135us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember   | 121us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                   | 125us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_NoncontrollingInterestMember                 |
| Balance at Dec. 31, 2014                                                                                      | 3,654us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest                 | 745us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember   | 2us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember   | 3,139us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember   | (364)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                 | 132us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_NoncontrollingInterestMember                 |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**                                                |                                                                                                |                                                                                                                                                  |                                                                                                                                                            |                                                                                                                                                         |                                                                                                                                                                                          |                                                                                                                                                                           |
| Profit of consolidated companies                                                                              | 135us-gaap_ProfitLoss                                                                               |                                                                                                                                                  |                                                                                                                                                            | 133us-gaap_ProfitLoss/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                                                 |                                                                                                                                                                                          | 2us-gaap_ProfitLoss/ us-gaap_StatementEquityComponentsAxis= us-gaap_NoncontrollingInterestMember                                                                               |
| Dividend paid to Caterpillar                                                                                  | (100)us-gaap_PaymentsOfDividends                                                                    |                                                                                                                                                  |                                                                                                                                                            | (100)us-gaap_PaymentsOfDividends/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                                      |                                                                                                                                                                                          |                                                                                                                                                                           |
| Foreign currency translation, net of tax                                                                      | (402)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax |                                                                                                                                                  |                                                                                                                                                            |                                                                                                                                                         | (401)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember | (1)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax/ us-gaap_StatementEquityComponentsAxis= us-gaap_NoncontrollingInterestMember |
| Derivative financial instruments, net of tax                                                                  | 2us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax                          |                                                                                                                                                  |                                                                                                                                                            |                                                                                                                                                         | 2us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                          |                                                                                                                                                                           |
| Balance at Mar. 31, 2015                                                                                      | $ 3,289us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest               | $ 745us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember | $ 2us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember | $ 3,172us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember | $ (763)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember               | $ 133us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest/ us-gaap_StatementEquityComponentsAxis= us-gaap_NoncontrollingInterestMember               |

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Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).
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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.
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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.
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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.
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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.
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