| **PARENTHETICAL DATA TO THE CONSOLIDATED STATEMENTS OF PROFIT (USD $)In Millions, unless otherwise specified** | 12 Months Ended |
|----------------------------------------------------------------------------------------------------------------|-----------------|
||
| **Income Statement [Abstract]**                                                                                |            |
| Total other-than-temporary impairment losses                                                                   | $ 46            |
| Portion of losses recognized in Accumulated other comprehensive income (loss) before taxes                     | (12)            |
| Net impairment losses recognized in earnings                                                                   | $ 34            |

| X                                                                                                                                                                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Other than temporary impairment losses on retained interests, before tax, recorded in earnings.
+ References
No definition available.
+ Details**Name:**cfsc_NetImpairmentLossesRecognizedInEarnings**Namespace Prefix:**cfsc_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The noncredit related component of other than temporary impairment losses on retained interests recorded in Accumulated other comprehensive income/(loss) before taxes.
+ References
No definition available.
+ Details**Name:**cfsc_PortionOfLossesRecognizedInAccumulatedOtherComprehensiveIncomeLossBeforeTaxes**Namespace Prefix:**cfsc_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The total amount of other than temporary impairment losses on retained interests.
+ References
No definition available.
+ Details**Name:**cfsc_TotalOtherThanTemporaryImpairmentLosses**Namespace Prefix:**cfsc_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_IncomeStatementAbstract**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |