| **Income Taxes (Details 5) (USD $)In Millions, unless otherwise specified** | Dec. 31, 2014                                                                                                                                                              | Dec. 31, 2013                                           | Dec. 31, 2012                                           |
|-----------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------|---------------------------------------------------------|
| **Net operating loss (NOL) carryforwards**                                  |                                                                                                                                                                       |                                                    |                                                    |
| Gross deferred income tax asset associated with NOL carryforwards           | $ 46us-gaap_DeferredTaxAssetsOperatingLossCarryforwards                                                                                                                    | $ 56us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | $ 59us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |
| U.S. state taxing jurisdictions                                             |                                                                                                                                                                       |                                                    |                                                    |
| **Net operating loss (NOL) carryforwards**                                  |                                                                                                                                                                       |                                                    |                                                    |
| NOL carryforwards                                                           | 136us-gaap_OperatingLossCarryforwards/ us-gaap_IncomeTaxAuthorityAxis= us-gaap_StateAndLocalJurisdictionMember                                                             |                                                    |                                                    |
| Gross deferred income tax asset associated with NOL carryforwards           | 11us-gaap_DeferredTaxAssetsOperatingLossCarryforwards/ us-gaap_IncomeTaxAuthorityAxis= us-gaap_StateAndLocalJurisdictionMember                                             |                                                    |                                                    |
| U.S. state taxing jurisdictions | Expiration Date 2015                      |                                                                                                                                                                       |                                                    |                                                    |
| **Net operating loss (NOL) carryforwards**                                  |                                                                                                                                                                       |                                                    |                                                    |
| NOL carryforwards                                                           | 0us-gaap_OperatingLossCarryforwards/ cfsc_ExpirationDateAxis= cfsc_ExpirationDate2015Member/ us-gaap_IncomeTaxAuthorityAxis= us-gaap_StateAndLocalJurisdictionMember       |                                                    |                                                    |
| U.S. state taxing jurisdictions | Expiration Date 2016                      |                                                                                                                                                                       |                                                    |                                                    |
| **Net operating loss (NOL) carryforwards**                                  |                                                                                                                                                                       |                                                    |                                                    |
| NOL carryforwards                                                           | 0us-gaap_OperatingLossCarryforwards/ cfsc_ExpirationDateAxis= cfsc_ExpirationDate2016Member/ us-gaap_IncomeTaxAuthorityAxis= us-gaap_StateAndLocalJurisdictionMember       |                                                    |                                                    |
| U.S. state taxing jurisdictions | Expiration Date 2017                      |                                                                                                                                                                       |                                                    |                                                    |
| **Net operating loss (NOL) carryforwards**                                  |                                                                                                                                                                       |                                                    |                                                    |
| NOL carryforwards                                                           | 0us-gaap_OperatingLossCarryforwards/ cfsc_ExpirationDateAxis= cfsc_ExpirationDate2017Member/ us-gaap_IncomeTaxAuthorityAxis= us-gaap_StateAndLocalJurisdictionMember       |                                                    |                                                    |
| U.S. state taxing jurisdictions | Expiration Date 2018                      |                                                                                                                                                                       |                                                    |                                                    |
| **Net operating loss (NOL) carryforwards**                                  |                                                                                                                                                                       |                                                    |                                                    |
| NOL carryforwards                                                           | 6us-gaap_OperatingLossCarryforwards/ cfsc_ExpirationDateAxis= cfsc_ExpirationDate2018Member/ us-gaap_IncomeTaxAuthorityAxis= us-gaap_StateAndLocalJurisdictionMember       |                                                    |                                                    |
| U.S. state taxing jurisdictions | Expiration Date 2019-2030                 |                                                                                                                                                                       |                                                    |                                                    |
| **Net operating loss (NOL) carryforwards**                                  |                                                                                                                                                                       |                                                    |                                                    |
| NOL carryforwards                                                           | 130us-gaap_OperatingLossCarryforwards/ cfsc_ExpirationDateAxis= cfsc_ExpirationDate20192030Member/ us-gaap_IncomeTaxAuthorityAxis= us-gaap_StateAndLocalJurisdictionMember |                                                    |                                                    |
| Non-U.S. taxing jurisdictions                                               |                                                                                                                                                                       |                                                    |                                                    |
| **Net operating loss (NOL) carryforwards**                                  |                                                                                                                                                                       |                                                    |                                                    |
| NOL carryforwards                                                           | 157us-gaap_OperatingLossCarryforwards/ us-gaap_IncomeTaxAuthorityAxis= us-gaap_ForeignCountryMember                                                                        |                                                    |                                                    |
| NOL carryforwards, Valuation allowance                                      | 2us-gaap_OperatingLossCarryforwardsValuationAllowance/ us-gaap_IncomeTaxAuthorityAxis= us-gaap_ForeignCountryMember                                                        |                                                    |                                                    |
| Non-U.S. taxing jurisdictions | Expiration Date 2015                        |                                                                                                                                                                       |                                                    |                                                    |
| **Net operating loss (NOL) carryforwards**                                  |                                                                                                                                                                       |                                                    |                                                    |
| NOL carryforwards                                                           | 3us-gaap_OperatingLossCarryforwards/ cfsc_ExpirationDateAxis= cfsc_ExpirationDate2015Member/ us-gaap_IncomeTaxAuthorityAxis= us-gaap_ForeignCountryMember                  |                                                    |                                                    |
| Non-U.S. taxing jurisdictions | Expiration Date 2016                        |                                                                                                                                                                       |                                                    |                                                    |
| **Net operating loss (NOL) carryforwards**                                  |                                                                                                                                                                       |                                                    |                                                    |
| NOL carryforwards                                                           | 1us-gaap_OperatingLossCarryforwards/ cfsc_ExpirationDateAxis= cfsc_ExpirationDate2016Member/ us-gaap_IncomeTaxAuthorityAxis= us-gaap_ForeignCountryMember                  |                                                    |                                                    |
| Non-U.S. taxing jurisdictions | Expiration Date 2017                        |                                                                                                                                                                       |                                                    |                                                    |
| **Net operating loss (NOL) carryforwards**                                  |                                                                                                                                                                       |                                                    |                                                    |
| NOL carryforwards                                                           | 0us-gaap_OperatingLossCarryforwards/ cfsc_ExpirationDateAxis= cfsc_ExpirationDate2017Member/ us-gaap_IncomeTaxAuthorityAxis= us-gaap_ForeignCountryMember                  |                                                    |                                                    |
| Non-U.S. taxing jurisdictions | Expiration Date 2018                        |                                                                                                                                                                       |                                                    |                                                    |
| **Net operating loss (NOL) carryforwards**                                  |                                                                                                                                                                       |                                                    |                                                    |
| NOL carryforwards                                                           | 0us-gaap_OperatingLossCarryforwards/ cfsc_ExpirationDateAxis= cfsc_ExpirationDate2018Member/ us-gaap_IncomeTaxAuthorityAxis= us-gaap_ForeignCountryMember                  |                                                    |                                                    |
| Non-U.S. taxing jurisdictions | Expiration Date 2019-2030                   |                                                                                                                                                                       |                                                    |                                                    |
| **Net operating loss (NOL) carryforwards**                                  |                                                                                                                                                                       |                                                    |                                                    |
| NOL carryforwards                                                           | 14us-gaap_OperatingLossCarryforwards/ cfsc_ExpirationDateAxis= cfsc_ExpirationDate20192030Member/ us-gaap_IncomeTaxAuthorityAxis= us-gaap_ForeignCountryMember             |                                                    |                                                    |
| Non-U.S. taxing jurisdictions | Unlimited                                   |                                                                                                                                                                       |                                                    |                                                    |
| **Net operating loss (NOL) carryforwards**                                  |                                                                                                                                                                       |                                                    |                                                    |
| NOL carryforwards                                                           | 139us-gaap_OperatingLossCarryforwards/ cfsc_ExpirationDateAxis= cfsc_NoExpirationDateMember/ us-gaap_IncomeTaxAuthorityAxis= us-gaap_ForeignCountryMember                  |                                                    |                                                    |
| Maximum | U.S. state taxing jurisdictions                                   |                                                                                                                                                                       |                                                    |                                                    |
| **Net operating loss (NOL) carryforwards**                                  |                                                                                                                                                                       |                                                    |                                                    |
| NOL carryforwards, Valuation allowance                                      | $ 1us-gaap_OperatingLossCarryforwardsValuationAllowance/ us-gaap_IncomeTaxAuthorityAxis= us-gaap_StateAndLocalJurisdictionMember/ us-gaap_RangeAxis= us-gaap_MaximumMember |                                                    |                                                    |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.
+ References
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| X                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized.
+ References
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| X                                                                                                                                                   |
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| X                                                                                                                                                              |
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| X                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------|
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