v3.26.1
Financial Risks - Summary of Net Changes in the Allowance for Credit Losses (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Disclosure of financial assets [line items]    
Provision for credit loss, net of reversal ¥ 8,060 ¥ 9,835
Charge-offs (9,646) (3,128)
Other (7,850) (1,516)
Finance lease receivables [Member]    
Disclosure of financial assets [line items]    
Allowance for credit loss at beginning of year 56,721 46,909
Provision for credit loss, net of reversal 19,169 21,140
Charge-offs (12,017) (10,311)
Other 3,688 (1,017)
Allowance for credit loss at end of year 67,560 56,721
Retail receivables [Member]    
Disclosure of financial assets [line items]    
Allowance for credit loss at beginning of year 356,304 336,152
Provision for credit loss, net of reversal 190,067 206,968
Charge-offs (197,813) (189,044)
Other 33,593 2,228
Allowance for credit loss at end of year 382,152 356,304
Retail receivables [Member] | Expected credit loss for 12 months [Member]    
Disclosure of financial assets [line items]    
Allowance for credit loss at beginning of year 117,832 111,044
Provision for credit loss, net of reversal 1,888 9,648
Other 8,019 (2,860)
Allowance for credit loss at end of year 127,739 117,832
Retail receivables [Member] | Expected credit loss for the entire period [Member] | Financial receivable not credit-impaired [Member]    
Disclosure of financial assets [line items]    
Allowance for credit loss at beginning of year 150,885 147,790
Provision for credit loss, net of reversal (6,575) 1,827
Other 13,582 1,269
Allowance for credit loss at end of year 157,892 150,885
Retail receivables [Member] | Expected credit loss for the entire period [Member] | Credit-impaired financial receivable [Member]    
Disclosure of financial assets [line items]    
Allowance for credit loss at beginning of year 87,587 77,318
Provision for credit loss, net of reversal 194,754 195,494
Charge-offs (197,813) (189,044)
Other 11,991 3,818
Allowance for credit loss at end of year 96,520 87,587
Wholesale receivables and other dealer loans [Member]    
Disclosure of financial assets [line items]    
Allowance for credit loss at beginning of year   31,213
Provision for credit loss, net of reversal 11,033 7,256
Charge-offs (482) (698)
Other 4,688 20
Allowance for credit loss at end of year 53,031  
Wholesale receivables and other dealer loans [Member] | Expected credit loss for 12 months [Member]    
Disclosure of financial assets [line items]    
Allowance for credit loss at beginning of year 24,697  
Provision for credit loss, net of reversal 2,930 7,009
Other 2,869 206
Allowance for credit loss at end of year 30,495 24,697
Wholesale receivables and other dealer loans [Member] | Expected credit loss for the entire period [Member] | Financial receivable not credit-impaired [Member]    
Disclosure of financial assets [line items]    
Allowance for credit loss at beginning of year 7,018 5,931
Provision for credit loss, net of reversal 2,204 1,226
Other 996 (139)
Allowance for credit loss at end of year 10,219 7,018
Wholesale receivables and other dealer loans [Member] | Expected credit loss for the entire period [Member] | Credit-impaired financial receivable [Member]    
Disclosure of financial assets [line items]    
Allowance for credit loss at beginning of year 6,076 7,801
Provision for credit loss, net of reversal 5,900 (980)
Charge-offs (482) (698)
Other 824 (48)
Allowance for credit loss at end of year ¥ 12,317 ¥ 6,076