| **Concentration of Credit Risk (Details) (USD $)In Millions, unless otherwise specified** | 12 Months Ended                                                                                                            |
|-------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------|
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| **Concentration Risk**                                                                    |                                                                                                                       |   |   |
| Derivatives, Maximum exposure to credit loss, including accrued interest                  | 123cfsc_DerivativesMaximumExposureToCreditLoss                                                                             | 178cfsc_DerivativesMaximumExposureToCreditLoss | 306cfsc_DerivativesMaximumExposureToCreditLoss |
| Construction related industries                                                           |                                                                                                                       |   |   |
| **Concentration Risk**                                                                    |                                                                                                                       |   |   |
| Concentration Risk, Percentage                                                            | 33.00%us-gaap_ConcentrationRiskPercentage1/ us-gaap_ConcentrationRiskByTypeAxis= us-gaap_CustomerConcentrationRiskMember   | 33.00%us-gaap_ConcentrationRiskPercentage1/ us-gaap_ConcentrationRiskByTypeAxis= us-gaap_CustomerConcentrationRiskMember | 33.00%us-gaap_ConcentrationRiskPercentage1/ us-gaap_ConcentrationRiskByTypeAxis= us-gaap_CustomerConcentrationRiskMember |
| North America                                                                             |                                                                                                                       |   |   |
| **Concentration Risk**                                                                    |                                                                                                                       |   |   |
| Concentration Risk, Percentage                                                            | 50.00%us-gaap_ConcentrationRiskPercentage1/ us-gaap_ConcentrationRiskByTypeAxis= us-gaap_GeographicConcentrationRiskMember | 40.00%us-gaap_ConcentrationRiskPercentage1/ us-gaap_ConcentrationRiskByTypeAxis= us-gaap_GeographicConcentrationRiskMember | 40.00%us-gaap_ConcentrationRiskPercentage1/ us-gaap_ConcentrationRiskByTypeAxis= us-gaap_GeographicConcentrationRiskMember |

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| - Definition
The maximum exposure to credit loss on derivative contracts before the application of any master netting agreements.
+ References
No definition available.
+ Details**Name:**cfsc_DerivativesMaximumExposureToCreditLoss**Namespace Prefix:**cfsc_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
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| - Details**Name:**us-gaap_ConcentrationRiskLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
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| - Definition
For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592
+ Details**Name:**us-gaap_ConcentrationRiskPercentage1**Namespace Prefix:**us-gaap_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                   |
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| - Details**Name:**us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                     |
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| - Details**Name:**us-gaap_ConcentrationRiskByTypeAxis=us-gaap_GeographicConcentrationRiskMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |