v3.26.1
Segment Information - Summary of Segment Information (Parenthetical) (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Disclosure of operating segments [line items]      
Segment assets ¥ 33,509,285 ¥ 30,775,867 ¥ 29,774,150
Provisions for product warranties 1,055,584    
Write-down of inventories recognized as an expense 49,804 120,919 12,220
Impairment loss recognised in profit or loss 692,006 39,305 59,392
Automobile business [member] | Disposal groups classified as held for sale [member]      
Disclosure of operating segments [line items]      
Segment assets 106,097    
Impairment loss recognised in profit or loss 48,328    
Unallocated corporate assets [member]      
Disclosure of operating segments [line items]      
Segment assets 976,245 979,954 1,573,834
Product warranties [member]      
Disclosure of operating segments [line items]      
Provisions for product warranties ¥ 319,613 [1] ¥ 454,502 ¥ 536,590
[1] Honda recognizes provisions for product warranties to cover future product warranty expenses. Honda recognizes costs for general warranties on products Honda sells and for specific warranty programs, including product recalls.