| **Income Taxes (Details 5) $ in Millions**                        | Dec. 31, 2016 USD ($) |
|-------------------------------------------------------------------|-----------------------|
| **Tax credit carryforwards**                                      |                  |
| U.S. foreign tax credits available for carryforward               | $ 41                  |
| U.S. state taxing jurisdictions                                   |                  |
| **Net operating loss (NOL) carryforwards**                        |                  |
| NOL carryforwards                                                 | 175                   |
| Gross deferred income tax asset associated with NOL carryforwards | 13                    |
| NOL carryforwards, Valuation allowance                            | 1                     |
| U.S. state taxing jurisdictions | Expiration Date 2017            |                  |
| **Net operating loss (NOL) carryforwards**                        |                  |
| NOL carryforwards                                                 | 2                     |
| U.S. state taxing jurisdictions | Expiration Date 2018            |                  |
| **Net operating loss (NOL) carryforwards**                        |                  |
| NOL carryforwards                                                 | 6                     |
| U.S. state taxing jurisdictions | Expiration Date 2019            |                  |
| **Net operating loss (NOL) carryforwards**                        |                  |
| NOL carryforwards                                                 | 4                     |
| U.S. state taxing jurisdictions | Expiration Date 2020            |                  |
| **Net operating loss (NOL) carryforwards**                        |                  |
| NOL carryforwards                                                 | 1                     |
| U.S. state taxing jurisdictions | Expiration Date 2021-2031       |                  |
| **Net operating loss (NOL) carryforwards**                        |                  |
| NOL carryforwards                                                 | 162                   |
| Non-U.S. taxing jurisdictions                                     |                  |
| **Net operating loss (NOL) carryforwards**                        |                  |
| NOL carryforwards                                                 | 80                    |
| NOL carryforwards, Valuation allowance                            | 9                     |
| Non-U.S. taxing jurisdictions | Expiration Date 2017              |                  |
| **Net operating loss (NOL) carryforwards**                        |                  |
| NOL carryforwards                                                 | 0                     |
| Non-U.S. taxing jurisdictions | Expiration Date 2018              |                  |
| **Net operating loss (NOL) carryforwards**                        |                  |
| NOL carryforwards                                                 | 0                     |
| Non-U.S. taxing jurisdictions | Expiration Date 2019              |                  |
| **Net operating loss (NOL) carryforwards**                        |                  |
| NOL carryforwards                                                 | 0                     |
| Non-U.S. taxing jurisdictions | Expiration Date 2020              |                  |
| **Net operating loss (NOL) carryforwards**                        |                  |
| NOL carryforwards                                                 | 7                     |
| Non-U.S. taxing jurisdictions | Expiration Date 2021-2031         |                  |
| **Net operating loss (NOL) carryforwards**                        |                  |
| NOL carryforwards                                                 | 29                    |
| Non-U.S. taxing jurisdictions | Unlimited                         |                  |
| **Net operating loss (NOL) carryforwards**                        |                  |
| NOL carryforwards                                                 | $ 44                  |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68052875&loc=d3e28680-109314Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32632-109319
+ Details**Name:**us-gaap_DeferredTaxAssetsOperatingLossCarryforwards**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - References
No definition available.
+ Details**Name:**us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAbstract**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32632-109319
+ Details**Name:**us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319
+ Details**Name:**us-gaap_OperatingLossCarryforwards**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
+ Details**Name:**us-gaap_OperatingLossCarryforwardsLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| 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
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 30 -Paragraph 5 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64814285&loc=d3e30536-109315Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319
+ Details**Name:**us-gaap_OperatingLossCarryforwardsValuationAllowance**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_IncomeTaxAuthorityAxis=us-gaap_StateAndLocalJurisdictionMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**cfsc_ExpirationDateAxis=cfsc_ExpirationDate2017Member**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**cfsc_ExpirationDateAxis=cfsc_ExpirationDate2018Member**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**cfsc_ExpirationDateAxis=cfsc_ExpirationDate2019Member**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**cfsc_ExpirationDateAxis=cfsc_ExpirationDate2020Member**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**cfsc_ExpirationDateAxis=cfsc_ExpirationDate20212031Member**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_IncomeTaxAuthorityAxis=us-gaap_ForeignCountryMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                           |
|---------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**cfsc_ExpirationDateAxis=cfsc_NoExpirationDateMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |