| **Derivative Financial Instruments and Risk Management (Details 4) - USD ($) $ in Millions**                | Jun. 30, 2023 | Dec. 31, 2022 |
|-------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Derivatives, Fair Value**                                                                                 |          |          |
| Carrying Value of the Hedged Liabilities                                                                    | $ 2,147       | $ 2,091       |
| Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Value of the Hedged Liabilities | (107)         | (112)         |
| Current maturities of long-term debt                                                                        |          |          |
| **Derivatives, Fair Value**                                                                                 |          |          |
| Carrying Value of the Hedged Liabilities                                                                    | 195           | 0             |
| Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Value of the Hedged Liabilities | (5)           | 0             |
| Long-term debt                                                                                              |          |          |
| **Derivatives, Fair Value**                                                                                 |          |          |
| Carrying Value of the Hedged Liabilities                                                                    | 1,952         | 2,091         |
| Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Value of the Hedged Liabilities | $ (102)       | $ (112)       |

| 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_DerivativesFairValueLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of liability hedged in fair value hedging relationship.
+ References
Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959
+ Details**Name:**us-gaap_HedgedLiabilityFairValueHedge**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk.
+ References
Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959
+ Details**Name:**us-gaap_HedgedLiabilityFairValueHedgeCumulativeIncreaseDecrease**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_BalanceSheetLocationAxis=cfsc_LongTermDebtDueWithinOneYearMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_BalanceSheetLocationAxis=cfsc_LongTermDebtDueAfterOneYearMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |