Allowance for Credit Losses - Additional Information (Details) - Finance Receivables, Net [Member] - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Financing Receivable Allowance For Credit Losses [Line Items]
Increase in provision for credit losses		$ 488
ASU 2016-13 [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Increase in provision for credit losses		292
COVID-19 [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Increase in provision for expected credit losses	$ 57	196
TMNA [Member] \| Financial Guarantee [Member] \| Dealer Products [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Ending Balance: collectively evaluated for impairment	929	1,028
Private Toyota Distributors [Member] \| Financial Guarantee [Member] \| Dealer Products [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Ending Balance: collectively evaluated for impairment	$ 187	$ 162

Financing receivable allowance for expected credit losses period increase decrease.

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- 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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- Definition

Amount of increase (decrease) in allowance for credit loss on financing receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

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- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ References

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