v3.26.1
Sales Revenue - Summary of Reconciliation of the Disaggregated Sales Revenue with the Four Reportable Segments (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total ¥ 21,796,610 ¥ 21,688,767 ¥ 20,428,802
External customers [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 21,796,610 21,688,767 20,428,802
External customers [member] | Japan [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 2,882,484 2,845,609 2,634,505
Operating segments [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 22,138,866 22,021,292 20,685,796
Operating segments [member] | Motorcycle business [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 4,018,837 3,626,603 3,220,168
Operating segments [member] | Automobile business [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 14,166,910 14,467,856 13,791,515
Operating segments [member] | Financial services business [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 3,532,743 3,512,223 3,251,784
Operating segments [member] | Power products and other businesses [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 420,376 414,610 422,329
Operating segments [member] | External customers [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers 19,705,627 19,804,550 18,812,715
Revenue arising from the other sources [1] 2,090,983 1,884,217 1,616,087
Total 21,796,610 21,688,767 20,428,802
Operating segments [member] | External customers [member] | Motorcycle business [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers 4,014,306 3,619,585 3,219,053
Revenue arising from the other sources [1] 4,531 7,018 1,115
Total 4,018,837 3,626,603 3,220,168
Operating segments [member] | External customers [member] | Automobile business [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers 13,842,565 14,149,801 13,541,447
Revenue arising from the other sources [1] 20,797 19,439 26,118
Total 13,863,362 14,169,240 13,567,565
Operating segments [member] | External customers [member] | Financial services business [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers 1,463,852 1,650,102 1,660,025
Revenue arising from the other sources [1] 2,065,632 1,857,664 1,588,783
Total 3,529,484 3,507,766 3,248,808
Operating segments [member] | External customers [member] | Power products and other businesses [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers 384,904 385,062 392,190
Revenue arising from the other sources [1] 23 96 71
Total 384,927 385,158 392,261
Operating segments [member] | External customers [member] | Japan [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers 2,222,220 2,183,674 1,959,248
Operating segments [member] | External customers [member] | Japan [member] | Motorcycle business [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers 113,293 106,632 113,746
Operating segments [member] | External customers [member] | Japan [member] | Automobile business [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers 1,803,549 1,794,911 1,586,358
Operating segments [member] | External customers [member] | Japan [member] | Financial services business [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers 206,813 193,188 172,072
Operating segments [member] | External customers [member] | Japan [member] | Power products and other businesses [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers 98,565 88,943 87,072
Operating segments [member] | External customers [member] | North America [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers 10,935,522 11,311,394 10,465,855
Operating segments [member] | External customers [member] | North America [member] | Motorcycle business [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers 351,787 347,503 335,545
Operating segments [member] | External customers [member] | North America [member] | Automobile business [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers 9,208,711 9,379,001 8,503,602
Operating segments [member] | External customers [member] | North America [member] | Financial services business [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers 1,256,995 1,456,899 1,487,948
Operating segments [member] | External customers [member] | North America [member] | Power products and other businesses [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers 118,029 127,991 138,760
Operating segments [member] | External customers [member] | Europe [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers 980,059 917,046 943,040
Operating segments [member] | External customers [member] | Europe [member] | Motorcycle business [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers 395,855 379,432 351,850
Operating segments [member] | External customers [member] | Europe [member] | Automobile business [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers 503,213 459,755 506,731
Operating segments [member] | External customers [member] | Europe [member] | Financial services business [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers
Operating segments [member] | External customers [member] | Europe [member] | Power products and other businesses [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers 80,991 77,859 84,459
Operating segments [member] | External customers [member] | Asia [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers 4,075,011 4,086,623 4,294,480
Operating segments [member] | External customers [member] | Asia [member] | Motorcycle business [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers 2,252,025 2,071,481 1,792,327
Operating segments [member] | External customers [member] | Asia [member] | Automobile business [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers 1,764,489 1,953,109 2,446,250
Operating segments [member] | External customers [member] | Asia [member] | Financial services business [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers 44 15 5
Operating segments [member] | External customers [member] | Asia [member] | Power products and other businesses [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers 58,453 62,018 55,898
Operating segments [member] | External customers [member] | Other regions [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers 1,492,815 1,305,813 1,150,092
Operating segments [member] | External customers [member] | Other regions [member] | Motorcycle business [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers 901,346 714,537 625,585
Operating segments [member] | External customers [member] | Other regions [member] | Automobile business [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers 562,603 563,025 498,506
Operating segments [member] | External customers [member] | Other regions [member] | Financial services business [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers
Operating segments [member] | External customers [member] | Other regions [member] | Power products and other businesses [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue arising from contracts with customers ¥ 28,866 ¥ 28,251 ¥ 26,001
[1] Revenue arising from the other sources primarily includes lease revenues recognized under IFRS 16 and interest recognized under IFRS 9.