v3.26.1
Financial Risk Management - Dealer Finance Receivables and Undiscounted Maximum Amounts of Potential Payment for Loan Commitments (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Dealer finance receivables:    
Dealer finance receivables ¥ 9,893,496 ¥ 8,928,617
Loan commitments:    
Loan commitments 158,368 127,348
Group A [member]    
Dealer finance receivables:    
Dealer finance receivables 579,930 529,263
Loan commitments:    
Loan commitments 137,015 107,073
Group B [member]    
Dealer finance receivables:    
Dealer finance receivables 275,868 216,803
Loan commitments:    
Loan commitments 21,353 20,275
Wholesale [member]    
Dealer finance receivables:    
Dealer finance receivables 855,798 746,066
12-month ECL [member]    
Loan commitments:    
Loan commitments 158,368 127,348
12-month ECL [member] | Group A [member]    
Dealer finance receivables:    
Dealer finance receivables 574,524 522,368
Loan commitments:    
Loan commitments 137,015 107,073
12-month ECL [member] | Group B [member]    
Dealer finance receivables:    
Dealer finance receivables 273,323 215,160
Loan commitments:    
Loan commitments 21,353 20,275
12-month ECL [member] | Wholesale [member]    
Dealer finance receivables:    
Dealer finance receivables 847,847 737,528
Lifetime ECL [member] | Not credit-impaired [member]    
Loan commitments:    
Loan commitments
Lifetime ECL [member] | Not credit-impaired [member] | Group A [member]    
Dealer finance receivables:    
Dealer finance receivables 3 1,866
Loan commitments:    
Loan commitments
Lifetime ECL [member] | Not credit-impaired [member] | Group B [member]    
Dealer finance receivables:    
Dealer finance receivables 2,545 1,617
Loan commitments:    
Loan commitments
Lifetime ECL [member] | Not credit-impaired [member] | Wholesale [member]    
Dealer finance receivables:    
Dealer finance receivables 2,548 3,483
Lifetime ECL [member] | Credit-impaired [member]    
Loan commitments:    
Loan commitments
Lifetime ECL [member] | Credit-impaired [member] | Group A [member]    
Dealer finance receivables:    
Dealer finance receivables 5,403 5,029
Loan commitments:    
Loan commitments
Lifetime ECL [member] | Credit-impaired [member] | Group B [member]    
Dealer finance receivables:    
Dealer finance receivables 26
Loan commitments:    
Loan commitments
Lifetime ECL [member] | Credit-impaired [member] | Wholesale [member]    
Dealer finance receivables:    
Dealer finance receivables ¥ 5,403 ¥ 5,055