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Allowance for Credit Losses - Additional Information (Details) - USD ($)
$ in Millions
6 Months Ended
Apr. 01, 2020
Sep. 30, 2020
Sep. 30, 2019
ASU 2016-13 [Member]      
Financing Receivable Allowance For Credit Losses [Line Items]      
Increase in provision for credit losses $ (90)    
Finance Receivables, Net [Member] | Retail Loan [Member]      
Financing Receivable Allowance For Credit Losses [Line Items]      
Increase in provision for credit losses   $ 447  
Finance Receivables, Net [Member] | Retail Loan [Member] | ASU 2016-13 [Member]      
Financing Receivable Allowance For Credit Losses [Line Items]      
Increase in provision for credit losses   292  
Finance Receivables, Net [Member] | Retail Loan [Member] | COVID-19 [Member]      
Financing Receivable Allowance For Credit Losses [Line Items]      
Increase in provision for expected credit losses   155  
Finance Receivables, Net [Member] | TMNA [Member] | Financial Guarantee [Member] | Dealer Products [Member]      
Financing Receivable Allowance For Credit Losses [Line Items]      
Ending Balance: collectively evaluated for impairment   995 $ 1,052
Finance Receivables, Net [Member] | Private Toyota Distributors [Member] | Financial Guarantee [Member] | Dealer Products [Member]      
Financing Receivable Allowance For Credit Losses [Line Items]      
Ending Balance: collectively evaluated for impairment   $ 145 $ 131