Finance Receivables, Net - Contractual Maturities on Retail Receivables and Dealer Financing (Details) $ in Millions	Mar. 31, 2019 USD ($)
Retail receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	$ 14,180
2021	12,866
2022	10,934
2023	8,618
2024	5,238
Thereafter	2,103
Total	53,939
Dealer financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	12,957
2021	1,519
2022	924
2023	588
2024	646
Thereafter	1,062
Total	$ 17,696

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

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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 three years but greater than two 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 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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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

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- Details

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Namespace Prefix:
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Period Type: