| **Finance Receivables - Write-offs by Origination Year (Details) - USD ($) $ in Millions** | 3 Months Ended | 9 Months Ended |
|--------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Write-offs by origination year [Line Items]**                                            |           |           |   |   |
| Total                                                                                      | $ 42           | $ 22           | $ 145 | $ 63 |
| Customer                                                                                   |           |           |   |   |
| **Write-offs by origination year [Line Items]**                                            |           |           |   |   |
| 2024 and 2023, respectively                                                                | 8              | 1              | 8 | 1 |
| 2023 and 2022, respectively                                                                | 12             | 6              | 24 | 15 |
| 2022 and 2021, respectively                                                                | 11             | 7              | 25 | 19 |
| 2021 and 2020, respectively                                                                | 4              | 4              | 15 | 12 |
| 2020 and 2019, respectively                                                                | 4              | 1              | 8 | 4 |
| Prior                                                                                      | 1              | 1              | 10 | 3 |
| Revolving Finance Receivables                                                              | 2              | 2              | 8 | 9 |
| Total                                                                                      | 42             | 22             | 98 | 63 |
| Customer | North America                                                                   |           |           |   |   |
| **Write-offs by origination year [Line Items]**                                            |           |           |   |   |
| 2024 and 2023, respectively                                                                | 0              | 1              | 0 | 1 |
| 2023 and 2022, respectively                                                                | 5              | 2              | 13 | 7 |
| 2022 and 2021, respectively                                                                | 4              | 2              | 10 | 7 |
| 2021 and 2020, respectively                                                                | 2              | 1              | 5 | 2 |
| 2020 and 2019, respectively                                                                | 1              | 1              | 2 | 2 |
| Prior                                                                                      | 0              | 0              | 1 | 1 |
| Revolving Finance Receivables                                                              | 2              | 2              | 8 | 9 |
| Total                                                                                      | 14             | 9              | 39 | 29 |
| Customer | EAME                                                                            |           |           |   |   |
| **Write-offs by origination year [Line Items]**                                            |           |           |   |   |
| 2024 and 2023, respectively                                                                | 0              | 0              | 0 | 0 |
| 2023 and 2022, respectively                                                                | 0              | 1              | 2 | 2 |
| 2022 and 2021, respectively                                                                | 1              | 1              | 3 | 3 |
| 2021 and 2020, respectively                                                                | 1              | 1              | 3 | 3 |
| 2020 and 2019, respectively                                                                | 1              | 0              | 2 | 0 |
| Prior                                                                                      | 0              | 0              | 0 | 1 |
| Revolving Finance Receivables                                                              | 0              | 0              | 0 | 0 |
| Total                                                                                      | 3              | 3              | 10 | 9 |
| Customer | Asia/Pacific                                                                    |           |           |   |   |
| **Write-offs by origination year [Line Items]**                                            |           |           |   |   |
| 2024 and 2023, respectively                                                                | 0              | 0              | 0 | 0 |
| 2023 and 2022, respectively                                                                | 2              | 2              | 4 | 3 |
| 2022 and 2021, respectively                                                                | 1              | 3              | 4 | 6 |
| 2021 and 2020, respectively                                                                | 0              | 1              | 3 | 4 |
| 2020 and 2019, respectively                                                                | 0              | 0              | 1 | 1 |
| Prior                                                                                      | 1              | 0              | 1 | 0 |
| Revolving Finance Receivables                                                              | 0              | 0              | 0 | 0 |
| Total                                                                                      | 4              | 6              | 13 | 14 |
| Customer | Mining                                                                          |           |           |   |   |
| **Write-offs by origination year [Line Items]**                                            |           |           |   |   |
| 2024 and 2023, respectively                                                                | 8              |           | 8 |   |
| 2023 and 2022, respectively                                                                | 3              |           | 3 |   |
| 2022 and 2021, respectively                                                                | 3              |           | 3 |   |
| 2021 and 2020, respectively                                                                | 0              |           | 0 |   |
| 2020 and 2019, respectively                                                                | 0              |           | 0 |   |
| Prior                                                                                      | 0              |           | 0 |   |
| Revolving Finance Receivables                                                              | 0              |           | 0 |   |
| Total                                                                                      | 14             |           | 14 |   |
| Customer | Latin America                                                                   |           |           |   |   |
| **Write-offs by origination year [Line Items]**                                            |           |           |   |   |
| 2024 and 2023, respectively                                                                | 0              | 0              | 0 | 0 |
| 2023 and 2022, respectively                                                                | 2              | 1              | 2 | 3 |
| 2022 and 2021, respectively                                                                | 2              | 1              | 5 | 3 |
| 2021 and 2020, respectively                                                                | 1              | 1              | 4 | 3 |
| 2020 and 2019, respectively                                                                | 2              | 0              | 3 | 1 |
| Prior                                                                                      | 0              | 1              | 8 | 1 |
| Revolving Finance Receivables                                                              | 0              | 0              | 0 | 0 |
| Total                                                                                      | $ 7            | $ 4            | $ 22 | $ 11 |

| X                                                                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Write-offs by origination year [Line Items]
+ References
No definition available.
+ Details**Name:**cfsc_WriteOffsByOriginationYearLineItems**Namespace Prefix:**cfsc_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of writeoff of financing receivable, charged against allowance for credit loss.
+ References
Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-11BReference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13
+ Details**Name:**us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of writeoff of financing receivable originated more than five years before current fiscal year. Excludes net investment in lease.
+ References
Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6
+ Details**Name:**us-gaap_FinancingReceivableOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of writeoff of financing receivable that can be withdrawn, repaid, and redrawn.
+ References
Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6
+ Details**Name:**us-gaap_FinancingReceivableRevolvingWriteoff**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of writeoff of financing receivable originated four years before current fiscal year. Excludes net investment in lease.
+ References
Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6
+ Details**Name:**us-gaap_FinancingReceivableYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of writeoff of financing receivable originated three years before current fiscal year. Excludes net investment in lease.
+ References
Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6
+ Details**Name:**us-gaap_FinancingReceivableYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of writeoff of financing receivable originated in current fiscal year. Excludes net investment in lease.
+ References
Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6
+ Details**Name:**us-gaap_FinancingReceivableYearOneOriginatedCurrentFiscalYearWriteoff**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of writeoff of financing receivable originated two years before current fiscal year. Excludes net investment in lease.
+ References
Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6
+ Details**Name:**us-gaap_FinancingReceivableYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of writeoff of financing receivable originated in fiscal year before current fiscal year. Excludes net investment in lease.
+ References
Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6
+ Details**Name:**us-gaap_FinancingReceivableYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FinancingReceivablePortfolioSegmentAxis=cfsc_CustomerMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=srt_NorthAmericaMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_EMEAMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                           |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=srt_AsiaPacificMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cfsc_MiningMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=srt_LatinAmericaMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |