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Related Party Transactions - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2023
Jun. 30, 2023
Apr. 30, 2023
Mar. 31, 2022
Related Party Transaction [Line Items]        
Subvention support receivable   $ 111   $ 79
Toyota Financial Services International Corporation [Member]        
Related Party Transaction [Line Items]        
Declared and paid cash dividends $ 2,500      
TMS [Member] | Financing Support to Affiliates [Member]        
Related Party Transaction [Line Items]        
Maximum borrowing capacity     $ 500  
TMCC-affiliated companies [Member] | Financing Support to Affiliates [Member]        
Related Party Transaction [Line Items]        
Maximum borrowing capacity     $ 5,000