| **Fair Value Measurements (Details 4) (USD $)**                           | Mar. 31, 2015                                                                                                                                                                                                                                                | Dec. 31, 2014                                                                                                                                                                                                                                                |
|---------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| **Financial Instruments, Financial Liabilities, Balance Sheet Groupings** |                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                         |
| Short-term borrowings                                                     | $ (5,259,000,000)us-gaap_ShortTermBorrowings                                                                                                                                                                                                                 | $ (4,699,000,000)us-gaap_ShortTermBorrowings                                                                                                                                                                                                                 |
| Fair Value, Level 1                                                       |                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                         |
| **Financial Instruments, Financial Assets, Balance Sheet Groupings**      |                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                         |
| Cash and cash equivalents                                                 | 1,147,000,000us-gaap_CashAndCashEquivalentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member                                                                                                          | 857,000,000us-gaap_CashAndCashEquivalentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member                                                                                                            |
| Restricted cash and cash equivalents                                      | 16,000,000us-gaap_RestrictedCashAndInvestmentsCurrent/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member                                                                                                                   | 11,000,000us-gaap_RestrictedCashAndInvestmentsCurrent/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member                                                                                                                   |
| **Financial Instruments, Financial Liabilities, Balance Sheet Groupings** |                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                         |
| Short-term borrowings                                                     | (5,259,000,000)us-gaap_ShortTermBorrowings/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member                                                                                                                              | (4,699,000,000)us-gaap_ShortTermBorrowings/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member                                                                                                                              |
| Fair Value, Level 2                                                       |                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                         |
| **Financial Instruments, Financial Assets, Balance Sheet Groupings**      |                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                         |
| Foreign currency contracts, in a receivable position                      | 8,000,000us-gaap_ForeignCurrencyContractAssetFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                                                                        | 5,000,000us-gaap_ForeignCurrencyContractAssetFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                                                                        |
| Interest rate swaps, in a net receivable position                         | 77,000,000us-gaap_InterestRateDerivativeAssetsAtFairValue/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                                                                               | 79,000,000us-gaap_InterestRateDerivativeAssetsAtFairValue/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                                                                               |
| **Financial Instruments, Financial Liabilities, Balance Sheet Groupings** |                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                         |
| Foreign currency contracts, in a payable position                         | (18,000,000)us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                                                                | (15,000,000)us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                                                                |
| Long-term debt                                                            | (24,107,000,000)us-gaap_LongTermDebtFairValue/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                                                                                           | (25,103,000,000)us-gaap_LongTermDebtFairValue/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                                                                                           |
| Interest rate swaps, in a net payable position                            | (6,000,000)us-gaap_InterestRateDerivativeLiabilitiesAtFairValue/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                                                                         | (8,000,000)us-gaap_InterestRateDerivativeLiabilitiesAtFairValue/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                                                                         |
| Fair Value, Level 3                                                       |                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                         |
| **Financial Instruments, Financial Assets, Balance Sheet Groupings**      |                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                         |
| Finance receivables, net (excluding finance leases)                       | 20,688,000,000cfsc_FinanceReceivablesNet/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member                                                                                                                                | 21,093,000,000cfsc_FinanceReceivablesNet/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member                                                                                                                                |
| **Financial Instruments, Financial Liabilities, Balance Sheet Groupings** |                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                         |
| Guarantees                                                                | (1,000,000)us-gaap_GuaranteesFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member                                                                                                                        | (1,000,000)us-gaap_GuaranteesFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member                                                                                                                        |
| Carrying Amount                                                           |                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                         |
| **Financial Instruments, Financial Assets, Balance Sheet Groupings**      |                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                         |
| Cash and cash equivalents                                                 | 1,147,000,000us-gaap_CashAndCashEquivalentsFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                                                                             | 857,000,000us-gaap_CashAndCashEquivalentsFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                                                                               |
| Foreign currency contracts, in a receivable position                      | 8,000,000us-gaap_ForeignCurrencyContractAssetFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                                                                           | 5,000,000us-gaap_ForeignCurrencyContractAssetFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                                                                           |
| Finance receivables, net (excluding finance leases)                       | 20,918,000,000cfsc_FinanceReceivablesNet/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                                                                                                   | 21,434,000,000cfsc_FinanceReceivablesNet/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                                                                                                   |
| Restricted cash and cash equivalents                                      | 16,000,000us-gaap_RestrictedCashAndInvestmentsCurrent/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                                                                                      | 11,000,000us-gaap_RestrictedCashAndInvestmentsCurrent/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                                                                                      |
| Interest rate swaps, in a net receivable position                         | 77,000,000us-gaap_InterestRateDerivativeAssetsAtFairValue/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                                                                                  | 79,000,000us-gaap_InterestRateDerivativeAssetsAtFairValue/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                                                                                  |
| **Financial Instruments, Financial Liabilities, Balance Sheet Groupings** |                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                         |
| Foreign currency contracts, in a payable position                         | (18,000,000)us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                                                                   | (15,000,000)us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                                                                   |
| Short-term borrowings                                                     | (5,259,000,000)us-gaap_ShortTermBorrowings/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                                                                                                 | (4,699,000,000)us-gaap_ShortTermBorrowings/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                                                                                                 |
| Long-term debt                                                            | (23,500,000,000)us-gaap_LongTermDebtFairValue/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                                                                                              | (24,574,000,000)us-gaap_LongTermDebtFairValue/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                                                                                              |
| Interest rate swaps, in a net payable position                            | (6,000,000)us-gaap_InterestRateDerivativeLiabilitiesAtFairValue/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                                                                            | (8,000,000)us-gaap_InterestRateDerivativeLiabilitiesAtFairValue/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                                                                            |
| Guarantees                                                                | (1,000,000)us-gaap_GuaranteesFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                                                                                           | (1,000,000)us-gaap_GuaranteesFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                                                                                                           |
| Carrying amount of assets excluded from measurement at fair value         |                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                         |
| **Financial Instruments, Financial Assets, Balance Sheet Groupings**      |                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                         |
| Finance leases                                                            | 7,100,000,000cfsc_LeasesReceivableNetCommercialLeaseFinancing/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember                                                                                         | 7,640,000,000cfsc_LeasesReceivableNetCommercialLeaseFinancing/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember                                                                                         |
| Cross currency contracts | Fair Value, Level 2                            |                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                         |
| **Financial Instruments, Financial Assets, Balance Sheet Groupings**      |                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                         |
| Foreign currency contracts, in a receivable position                      | 27,000,000us-gaap_ForeignCurrencyContractAssetFairValueDisclosure/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_CrossCurrencyInterestRateContractMember/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                | 17,000,000us-gaap_ForeignCurrencyContractAssetFairValueDisclosure/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_CrossCurrencyInterestRateContractMember/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                |
| Cross currency contracts | Carrying Amount                                |                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                         |
| **Financial Instruments, Financial Assets, Balance Sheet Groupings**      |                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                         |
| Foreign currency contracts, in a receivable position                      | $ 27,000,000us-gaap_ForeignCurrencyContractAssetFairValueDisclosure/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_CrossCurrencyInterestRateContractMember/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember | $ 17,000,000us-gaap_ForeignCurrencyContractAssetFairValueDisclosure/ us-gaap_DerivativeInstrumentRiskAxis= us-gaap_CrossCurrencyInterestRateContractMember/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember |

| X                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The carrying amount of outstanding finance receivables including accrued interest that are being measured at fair value.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount, net of any allowance, of commercial loans (money lent to commercial entities rather than consumers) made in the form of direct financing leases where the reporting entity (lessor) only recognizes interest revenue from the lease. It also includes the amount of lease financing arising from involvement with leveraged lease transactions where the entity is in the position of long-term creditor.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016
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| X                                                                                                                                                                                                                                                                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
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| - Definition
Fair value portion of guarantee, including, but not limited to, financial standby letter of credit, fair value guarantee, guarantee of collection of scheduled contractual cash flows from financial assets, and contracts that contingently require the guarantor to make payments or perform services.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12201-110248
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
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| - Definition
The current cash, cash equivalents and investments that are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes current cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.
+ References
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| X                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                          |
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| X                                                                                                                                                                                            |
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