Finance Receivables, Net - Contractual Maturities on Retail Receivables and Dealer Financing (Details) $ in Millions	Mar. 31, 2020 USD ($)
Retail receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
2021	$ 14,437
2022	13,358
2023	11,780
2024	9,103
2025	5,696
Thereafter	2,714
Total	57,088
Dealer financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
2021	13,267
2022	1,476
2023	876
2024	676
2025	454
Thereafter	1,124
Total	$ 17,873

Notes receivables excluding estimated unguaranteed residual values in direct financing lease.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Receivables to customers expected to be collected in or after five years from the balance sheet date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Receivables to customers expected to be collected in less than five years but greater than four years from the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	tmcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Receivables to customers expected to be collected in less than four years but greater than three years from the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	tmcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Receivables to customers expected to be collected within one year from the balance sheet date.

+ References

No definition available.

+ Details

Name:	tmcc_NotesReceivableExcludingDirectFinancingLeaseEstimatedUnguaranteedResidualValuesMaturitiesWithinOneYear
Namespace Prefix:	tmcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Receivables to customers expected to be collected in less than three years but greater than two years from the balance sheet date.

+ References

No definition available.

+ Details

Name:	tmcc_NotesReceivableExcludingDirectFinancingLeaseEstimatedUnguaranteedResidualValuesMaturitiesWithinThreeYears
Namespace Prefix:	tmcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Receivables to customers expected to be collected in less than two years but greater than one year from the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	tmcc_
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

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

- Details

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Namespace Prefix:
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Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type: