v3.26.1
Segment Information - Summary of Segment Information (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Disclosure of operating segments [line items]      
Sales revenue ¥ 21,796,610 ¥ 21,688,767 ¥ 20,428,802
Segment profit (loss) (414,346) 1,213,486 1,381,977
Share of profit (loss) of investments accounted for using the equity method (162,080) 982 110,817
Segment assets 33,509,285 30,775,867 29,774,150
Investments accounted for using the equity method 1,128,118 1,242,614 1,206,968
Depreciation and amortization 1,650,545 1,612,805 1,579,486
Capital expenditures 3,804,709 4,036,808 3,141,179
Impairment losses on non-financial assets 692,006 39,305 59,392
Provision (reversal) for credit and lease residual losses on receivables from financial services 87,920 70,963 50,057
External customers [member]      
Disclosure of operating segments [line items]      
Sales revenue 21,796,610 21,688,767 20,428,802
Intersegment [member]      
Disclosure of operating segments [line items]      
Sales revenue
Operating segments [member]      
Disclosure of operating segments [line items]      
Sales revenue 22,138,866 22,021,292 20,685,796
Segment profit (loss) (414,346) 1,213,486 1,381,977
Share of profit (loss) of investments accounted for using the equity method (162,080) 982 110,817
Segment assets 33,074,665 30,413,268 28,441,388
Investments accounted for using the equity method 1,128,118 1,242,614 1,206,968
Depreciation and amortization 1,650,545 1,612,805 1,579,486
Capital expenditures 3,804,709 4,036,808 3,141,179
Impairment losses on non-financial assets 692,006 39,305 59,392
Provision (reversal) for credit and lease residual losses on receivables from financial services 87,920 70,963 50,057
Operating segments [member] | External customers [member]      
Disclosure of operating segments [line items]      
Sales revenue 21,796,610 21,688,767 20,428,802
Operating segments [member] | Intersegment [member]      
Disclosure of operating segments [line items]      
Sales revenue 342,256 332,525 256,994
Operating segments [member] | Motorcycle business [member]      
Disclosure of operating segments [line items]      
Sales revenue 4,018,837 3,626,603 3,220,168
Segment profit (loss) 731,926 663,443 556,232
Share of profit (loss) of investments accounted for using the equity method 65,206 59,060 53,843
Segment assets 2,713,735 2,248,809 2,047,270
Investments accounted for using the equity method 106,438 107,889 119,598
Depreciation and amortization 74,343 72,443 72,590
Capital expenditures 135,989 94,688 74,006
Impairment losses on non-financial assets 95 99 33
Provision (reversal) for credit and lease residual losses on receivables from financial services
Operating segments [member] | Motorcycle business [member] | External customers [member]      
Disclosure of operating segments [line items]      
Sales revenue 4,018,837 3,626,603 3,220,168
Operating segments [member] | Motorcycle business [member] | Intersegment [member]      
Disclosure of operating segments [line items]      
Sales revenue
Operating segments [member] | Automobile business [member]      
Disclosure of operating segments [line items]      
Sales revenue 14,166,910 14,467,856 13,791,515
Segment profit (loss) (1,411,140) 243,853 560,649
Share of profit (loss) of investments accounted for using the equity method (228,369) (59,867) 55,392
Segment assets 12,484,767 11,874,764 11,690,446
Investments accounted for using the equity method 1,005,559 1,117,102 1,076,481
Depreciation and amortization 601,267 642,506 655,250
Capital expenditures 879,031 797,831 598,475
Impairment losses on non-financial assets 605,150 18,477 44,652
Provision (reversal) for credit and lease residual losses on receivables from financial services
Operating segments [member] | Automobile business [member] | External customers [member]      
Disclosure of operating segments [line items]      
Sales revenue 13,863,362 14,169,240 13,567,565
Operating segments [member] | Automobile business [member] | Intersegment [member]      
Disclosure of operating segments [line items]      
Sales revenue 303,548 298,616 223,950
Operating segments [member] | Financial services business [member]      
Disclosure of operating segments [line items]      
Sales revenue 3,532,743 3,512,223 3,251,784
Segment profit (loss) 275,532 315,634 273,978
Share of profit (loss) of investments accounted for using the equity method
Segment assets 17,282,581 15,713,348 14,118,371
Investments accounted for using the equity method
Depreciation and amortization 958,880 881,500 834,246
Capital expenditures 2,766,150 3,125,821 2,451,930
Impairment losses on non-financial assets 81,833 20,660 14,646
Provision (reversal) for credit and lease residual losses on receivables from financial services 87,920 70,963 50,057
Operating segments [member] | Financial services business [member] | External customers [member]      
Disclosure of operating segments [line items]      
Sales revenue 3,529,484 3,507,766 3,248,808
Operating segments [member] | Financial services business [member] | Intersegment [member]      
Disclosure of operating segments [line items]      
Sales revenue 3,259 4,457 2,976
Operating segments [member] | Power products and other businesses [member]      
Disclosure of operating segments [line items]      
Sales revenue 420,376 414,610 422,329
Segment profit (loss) (10,664) (9,444) (8,882)
Share of profit (loss) of investments accounted for using the equity method 1,083 1,789 1,582
Segment assets 593,582 576,347 585,301
Investments accounted for using the equity method 16,121 17,623 10,889
Depreciation and amortization 16,055 16,356 17,400
Capital expenditures 23,539 18,468 16,768
Impairment losses on non-financial assets 4,928 69 61
Provision (reversal) for credit and lease residual losses on receivables from financial services
Operating segments [member] | Power products and other businesses [member] | External customers [member]      
Disclosure of operating segments [line items]      
Sales revenue 384,927 385,158 392,261
Operating segments [member] | Power products and other businesses [member] | Intersegment [member]      
Disclosure of operating segments [line items]      
Sales revenue 35,449 29,452 30,068
Reconciling items [member]      
Disclosure of operating segments [line items]      
Sales revenue (342,256) (332,525) (256,994)
Segment profit (loss)
Share of profit (loss) of investments accounted for using the equity method
Segment assets 434,620 362,599 1,332,762
Investments accounted for using the equity method
Depreciation and amortization
Capital expenditures
Impairment losses on non-financial assets
Provision (reversal) for credit and lease residual losses on receivables from financial services
Reconciling items [member] | External customers [member]      
Disclosure of operating segments [line items]      
Sales revenue
Reconciling items [member] | Intersegment [member]      
Disclosure of operating segments [line items]      
Sales revenue ¥ (342,256) ¥ (332,525) ¥ (256,994)