v3.26.1
Assets held for sale - Summary of Detailed Information of Assets Held for Sale (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Noncurrent Assets Or Disposal Groups Classified As Held For Sale [Line Items]        
Cash and cash equivalents ¥ 12,659,622 ¥ 8,982,404 ¥ 9,412,060 ¥ 7,516,966
Investments accounted for using the equity method 5,342,548 5,798,051 ¥ 5,710,106  
Land 1,351,625 1,428,122    
Buildings 6,284,907 6,170,063    
Machinery and equipment 17,509,377 16,621,243    
Less - Accumulated depreciation and impairment losses 19,504,000 18,533,826    
Total property, plant and equipment, net 17,067,365 15,333,693    
Total 2,016,804 0    
Short-term and current portion of long-term debt 17,581,104 15,829,516    
Liabilities for quality assurance 2,097,943 1,965,748    
Long-term debt 25,624,365 22,963,363    
Total 694,547 0    
Total 266,596 0    
Assets held for sale [member]        
Noncurrent Assets Or Disposal Groups Classified As Held For Sale [Line Items]        
Cash and cash equivalents 115,932 0    
Trade accounts and other receivables 229,138 0    
Inventories 230,229 0    
Investments accounted for using the equity method 800,635      
Land 165,526 0    
Buildings 428,406 0    
Machinery and equipment 698,884 0    
Other property, plant and equipment 16,154 0    
Total property, plant and equipment, at cost 1,308,970 0    
Less - Accumulated depreciation and impairment losses (826,852) 0    
Total property, plant and equipment, net 482,118 0    
Other assets 158,752 0    
Liabilities directly associated with assets held for sale [member]        
Noncurrent Assets Or Disposal Groups Classified As Held For Sale [Line Items]        
Trade accounts and other payables 227,966 0    
Short-term and current portion of long-term debt 142,256 0    
Accrued expenses 86,007 0    
Liabilities for quality assurance 104,227 0    
Long-term debt 21,317 0    
Other liabilities 112,774 0    
Other comprehensive income associated with assets held for sale [member]        
Noncurrent Assets Or Disposal Groups Classified As Held For Sale [Line Items]        
Net changes in revaluation of financial assets measured at fair value through other comprehensive income 148,535 0    
Exchange differences on translating foreign operations ¥ 118,061 ¥ 0