Finance Receivables (Details 2) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable
Amounts due in 2018	$ 13,121
Amounts due in 2019	5,606
Amounts due in 2020	3,896
Amounts due in 2021	2,246
Amounts due in 2022	1,236
Amounts due thereafter	942
Total	27,047
Guaranteed residual value	456
Unguaranteed residual value	841
Total gross finance receivables	28,344	$ 27,320
Retail Installment Sale Contracts
Accounts, Notes, Loans and Financing Receivable
Amounts due in 2018	2,798
Amounts due in 2019	2,031
Amounts due in 2020	1,281
Amounts due in 2021	629
Amounts due in 2022	212
Amounts due thereafter	26
Total	6,977
Guaranteed residual value	0
Unguaranteed residual value	0
Total gross finance receivables	6,977
Wholesale Installment Sale Contracts
Accounts, Notes, Loans and Financing Receivable
Amounts due in 2018	10
Amounts due in 2019	8
Amounts due in 2020	6
Amounts due in 2021	2
Amounts due in 2022	0
Amounts due thereafter	0
Total	26
Guaranteed residual value	0
Unguaranteed residual value	0
Total gross finance receivables	26
Retail Finance Leases
Accounts, Notes, Loans and Financing Receivable
Amounts due in 2018	2,758
Amounts due in 2019	1,920
Amounts due in 2020	1,078
Amounts due in 2021	444
Amounts due in 2022	153
Amounts due thereafter	57
Total	6,410
Guaranteed residual value	425
Unguaranteed residual value	835
Total gross finance receivables	7,670
Wholesale Finance Leases
Accounts, Notes, Loans and Financing Receivable
Amounts due in 2018	22
Amounts due in 2019	16
Amounts due in 2020	9
Amounts due in 2021	5
Amounts due in 2022	2
Amounts due thereafter	2
Total	56
Guaranteed residual value	31
Unguaranteed residual value	6
Total gross finance receivables	93
Retail Notes
Accounts, Notes, Loans and Financing Receivable
Amounts due in 2018	3,578
Amounts due in 2019	1,510
Amounts due in 2020	1,445
Amounts due in 2021	1,160
Amounts due in 2022	867
Amounts due thereafter	857
Total	9,417
Guaranteed residual value	0
Unguaranteed residual value	0
Total gross finance receivables	9,417
Wholesale Notes
Accounts, Notes, Loans and Financing Receivable
Amounts due in 2018	3,955
Amounts due in 2019	121
Amounts due in 2020	77
Amounts due in 2021	6
Amounts due in 2022	2
Amounts due thereafter	0
Total	4,161
Guaranteed residual value	0
Unguaranteed residual value	0
Total gross finance receivables	$ 4,161

This element represents the guaranteed residual value of outstanding finance receivables.

No definition available.

Name:	cfsc_GuaranteedResidualValue
Namespace Prefix:	cfsc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents the aggregate amount of finance receivables due as of the latest balance sheet presented in the financial statements.

+ References

No definition available.

+ Details

Name:	cfsc_OutstandingFinanceReceivablesAggregateAmounts
Namespace Prefix:	cfsc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents the amount of finance receivables due after year five following the date of the latest balance sheet presented in the financial statements.

+ References

No definition available.

+ Details

Name:	cfsc_OutstandingFinanceReceivablesDueAfterYearFive
Namespace Prefix:	cfsc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents the amount of finance receivables due within the next twelve months following the date of the latest balance sheet presented in the financial statements.

+ References

No definition available.

+ Details

Name:	cfsc_OutstandingFinanceReceivablesDueInNextTwelveMonths
Namespace Prefix:	cfsc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents the amount of finance receivables due in year five following the date of the latest balance sheet presented in the financial statements.

+ References

No definition available.

+ Details

Name:	cfsc_OutstandingFinanceReceivablesDueInYearFive
Namespace Prefix:	cfsc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents the amount of finance receivables due in year four following the date of the latest balance sheet presented in the financial statements.

+ References

No definition available.

+ Details

Name:	cfsc_OutstandingFinanceReceivablesDueInYearFour
Namespace Prefix:	cfsc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents the amount of finance receivables due in year three following the date of the latest balance sheet presented in the financial statements.

+ References

No definition available.

+ Details

Name:	cfsc_OutstandingFinanceReceivablesDueInYearThree
Namespace Prefix:	cfsc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents the amount of finance receivables due in year two following the date of the latest balance sheet presented in the financial statements.

+ References

No definition available.

+ Details

Name:	cfsc_OutstandingFinanceReceivablesDueInYearTwo
Namespace Prefix:	cfsc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents the unguaranteed residual value of outstanding finance receivables.

+ References

No definition available.

+ Details

Name:	cfsc_UnguaranteedResidualValue
Namespace Prefix:	cfsc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

+ Details

Name:	us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=cfsc_RetailInstallmentContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=cfsc_WholesaleInstallmentContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=cfsc_RetailFinanceLeasesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=cfsc_WholesaleFinanceLeasesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=cfsc_RetailNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=cfsc_WholesaleNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: