| **Finance Receivables - Finance receivables on non-accrual status (Details) - USD ($) $ in Millions** | Dec. 31, 2024 | Dec. 31, 2023 |
|-------------------------------------------------------------------------------------------------------|---------------|---------------|
| Customer                                                                                              |          |          |
| **Financing Receivable, Past Due**                                                                    |          |          |
| Amortized Cost, Non-accrual, With an Allowance                                                        | $ 176         | $ 152         |
| Amortized Cost, 91+ Still Accruing                                                                    | 30            | 44            |
| Customer | North America                                                                              |          |          |
| **Financing Receivable, Past Due**                                                                    |          |          |
| Amortized Cost, Non-accrual, With an Allowance                                                        | 83            | 52            |
| Amortized Cost, 91+ Still Accruing                                                                    | 20            | 20            |
| Customer | EAME                                                                                       |          |          |
| **Financing Receivable, Past Due**                                                                    |          |          |
| Amortized Cost, Non-accrual, With an Allowance                                                        | 33            | 34            |
| Amortized Cost, 91+ Still Accruing                                                                    | 5             | 18            |
| Customer | Asia/Pacific                                                                               |          |          |
| **Financing Receivable, Past Due**                                                                    |          |          |
| Amortized Cost, Non-accrual, With an Allowance                                                        | 5             | 8             |
| Amortized Cost, 91+ Still Accruing                                                                    | 5             | 5             |
| Customer | Mining                                                                                     |          |          |
| **Financing Receivable, Past Due**                                                                    |          |          |
| Amortized Cost, Non-accrual, With an Allowance                                                        | 29            | 2             |
| Amortized Cost, 91+ Still Accruing                                                                    | 0             | 0             |
| Customer | Latin America                                                                              |          |          |
| **Financing Receivable, Past Due**                                                                    |          |          |
| Amortized Cost, Non-accrual, With an Allowance                                                        | 24            | 48            |
| Amortized Cost, 91+ Still Accruing                                                                    | 0             | 1             |
| Customer | Power                                                                                      |          |          |
| **Financing Receivable, Past Due**                                                                    |          |          |
| Amortized Cost, Non-accrual, With an Allowance                                                        | 2             | 8             |
| Amortized Cost, 91+ Still Accruing                                                                    | 0             | 0             |
| Dealer | Latin America                                                                                |          |          |
| **Financing Receivable, Past Due**                                                                    |          |          |
| Amortized Cost, Non-accrual, With an Allowance                                                        | $ 0           | $ 47          |

| X                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Financing receivables that are 91 days or more past due and still accruing.
+ References
No definition available.
+ Details**Name:**cfsc_FinancingReceivable91DaysPastDueAndStillAccruing**Namespace Prefix:**cfsc_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease.
+ References
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| 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
Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-14Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 80 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-80
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| X                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                           |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------|
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