v3.26.1
Finance Receivables - Summary of Contractual Maturities (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Retail [Member]    
Statements [Line Items]    
Gross contractual amounts receivable for acquired receivables ¥ 31,837,922 ¥ 27,638,021
Retail [Member] | Within 1 year [Member]    
Statements [Line Items]    
Gross contractual amounts receivable for acquired receivables 8,659,405 7,518,918
Retail [Member] | Between 1 and 2 years [Member]    
Statements [Line Items]    
Gross contractual amounts receivable for acquired receivables 7,365,657 6,317,972
Retail [Member] | Between 2 and 3 years [Member]    
Statements [Line Items]    
Gross contractual amounts receivable for acquired receivables 6,372,603 5,500,349
Retail [Member] | Between 3 and 4 years [Member]    
Statements [Line Items]    
Gross contractual amounts receivable for acquired receivables 4,916,999 4,265,070
Retail [Member] | Between 4 and 5 years [Member]    
Statements [Line Items]    
Gross contractual amounts receivable for acquired receivables 2,841,501 2,623,094
Retail [Member] | Later than 5 years [Member]    
Statements [Line Items]    
Gross contractual amounts receivable for acquired receivables 1,681,757 1,412,619
Finance leases [Member]    
Statements [Line Items]    
Gross contractual amounts receivable for acquired receivables 3,330,663 2,814,157
Finance leases [Member] | Within 1 year [Member]    
Statements [Line Items]    
Gross contractual amounts receivable for acquired receivables 1,248,720 1,041,282
Finance leases [Member] | Between 1 and 2 years [Member]    
Statements [Line Items]    
Gross contractual amounts receivable for acquired receivables 904,612 745,842
Finance leases [Member] | Between 2 and 3 years [Member]    
Statements [Line Items]    
Gross contractual amounts receivable for acquired receivables 681,364 576,552
Finance leases [Member] | Between 3 and 4 years [Member]    
Statements [Line Items]    
Gross contractual amounts receivable for acquired receivables 338,381 320,721
Finance leases [Member] | Between 4 and 5 years [Member]    
Statements [Line Items]    
Gross contractual amounts receivable for acquired receivables 126,279 101,389
Finance leases [Member] | Later than 5 years [Member]    
Statements [Line Items]    
Gross contractual amounts receivable for acquired receivables 31,306 28,371
Wholesale and other dealer loans [Member]    
Statements [Line Items]    
Gross contractual amounts receivable for acquired receivables 5,821,931 4,902,537
Wholesale and other dealer loans [Member] | Within 1 year [Member]    
Statements [Line Items]    
Gross contractual amounts receivable for acquired receivables 4,481,525 3,617,276
Wholesale and other dealer loans [Member] | Between 1 and 2 years [Member]    
Statements [Line Items]    
Gross contractual amounts receivable for acquired receivables 452,366 367,663
Wholesale and other dealer loans [Member] | Between 2 and 3 years [Member]    
Statements [Line Items]    
Gross contractual amounts receivable for acquired receivables 233,452 231,623
Wholesale and other dealer loans [Member] | Between 3 and 4 years [Member]    
Statements [Line Items]    
Gross contractual amounts receivable for acquired receivables 168,333 162,658
Wholesale and other dealer loans [Member] | Between 4 and 5 years [Member]    
Statements [Line Items]    
Gross contractual amounts receivable for acquired receivables 134,005 119,871
Wholesale and other dealer loans [Member] | Later than 5 years [Member]    
Statements [Line Items]    
Gross contractual amounts receivable for acquired receivables ¥ 352,251 ¥ 403,444