v3.26.1
Bonds and Loans - Schedule of Composition of Bonds (Details)
€ in Millions, ¥ in Millions, $ in Millions
Mar. 31, 2026
JPY (¥)
Mar. 31, 2026
USD ($)
Mar. 31, 2026
EUR (€)
Jul. 02, 2025
USD ($)
Jun. 12, 2025
JPY (¥)
Mar. 31, 2025
JPY (¥)
Jul. 12, 2024
USD ($)
Jul. 05, 2024
USD ($)
Jun. 25, 2024
JPY (¥)
Disclosure of detailed information about borrowings [line items]                  
Bonds ¥ 4,656,812         ¥ 4,190,632      
Unsecured Senior Notes Assumed in Shire Acquisition                  
Disclosure of detailed information about borrowings [line items]                  
Principal amount in contractual currency (millions) | $   $ 500              
Bonds ¥ 81,332         195,295      
Interest rate (%) 5.25% 5.25% 5.25%            
Unsecured Senior Notes Assumed in Shire Acquisition                  
Disclosure of detailed information about borrowings [line items]                  
Principal amount in contractual currency (millions) | $   $ 1,500         $ 1,500    
Bonds ¥ 237,743         219,033      
Interest rate (%) 3.20% 3.20% 3.20%            
2018 EUR Unsecured Senior Notes – fixed rate                  
Disclosure of detailed information about borrowings [line items]                  
Principal amount in contractual currency (millions) | €     € 3,000            
Bonds ¥ 547,557         482,180      
2018 EUR Unsecured Senior Notes – fixed rate | Minimum                  
Disclosure of detailed information about borrowings [line items]                  
Interest rate (%) 2.25% 2.25% 2.25%            
2018 EUR Unsecured Senior Notes – fixed rate | Maximum                  
Disclosure of detailed information about borrowings [line items]                  
Interest rate (%) 3.00% 3.00% 3.00%            
2018 USD Unsecured Senior Notes – fixed rate                  
Disclosure of detailed information about borrowings [line items]                  
Principal amount in contractual currency (millions) | $   $ 1,750              
Bonds ¥ 278,416         259,681      
Interest rate (%) 5.00% 5.00% 5.00%            
2020 USD Unsecured Senior Notes – fixed rate                  
Disclosure of detailed information about borrowings [line items]                  
Principal amount in contractual currency (millions) | $   $ 7,000              
Bonds ¥ 1,111,083         1,037,021      
2020 USD Unsecured Senior Notes – fixed rate | Minimum                  
Disclosure of detailed information about borrowings [line items]                  
Interest rate (%) 2.05% 2.05% 2.05%            
2020 USD Unsecured Senior Notes – fixed rate | Maximum                  
Disclosure of detailed information about borrowings [line items]                  
Interest rate (%) 3.375% 3.375% 3.375%            
2020 EUR Unsecured Senior Notes – fixed rate                  
Disclosure of detailed information about borrowings [line items]                  
Principal amount in contractual currency (millions) | $   $ 3,600              
Bonds ¥ 655,829         577,703      
2020 EUR Unsecured Senior Notes – fixed rate | Minimum                  
Disclosure of detailed information about borrowings [line items]                  
Interest rate (%) 0.75% 0.75% 0.75%            
2020 EUR Unsecured Senior Notes – fixed rate | Maximum                  
Disclosure of detailed information about borrowings [line items]                  
Interest rate (%) 2.00% 2.00% 2.00%            
2021 JPY Unsecured Senior Bonds – fixed rate                  
Disclosure of detailed information about borrowings [line items]                  
Principal amount in contractual currency (millions) | $   $ 250,000              
Bonds ¥ 249,628         249,561      
Interest rate (%) 0.40% 0.40% 0.40%            
2024 Hybrid bonds (subordinated bonds)                  
Disclosure of detailed information about borrowings [line items]                  
Principal amount in contractual currency (millions) ¥ 460,000               ¥ 460,000
Bonds ¥ 458,443         457,983      
Spread on variable interest rate 1.934% 1.934% 1.934%            
2024 Hybrid bonds (subordinated bonds) | Japan Government Bond Interest Rate | Minimum                  
Disclosure of detailed information about borrowings [line items]                  
Interest rate (%) 1.40% 1.40% 1.40%            
2024 Hybrid bonds (subordinated bonds) | Japan Government Bond Interest Rate | Maximum                  
Disclosure of detailed information about borrowings [line items]                  
Interest rate (%) 2.40% 2.40% 2.40%            
2024 USD Unsecured Senior Notes – fixed rate                  
Disclosure of detailed information about borrowings [line items]                  
Principal amount in contractual currency (millions) | $   $ 3,000           $ 3,000  
Bonds ¥ 473,755         442,175      
2024 USD Unsecured Senior Notes – fixed rate | Minimum                  
Disclosure of detailed information about borrowings [line items]                  
Interest rate (%) 5.30% 5.30% 5.30%            
2024 USD Unsecured Senior Notes – fixed rate | Maximum                  
Disclosure of detailed information about borrowings [line items]                  
Interest rate (%) 5.80% 5.80% 5.80%            
2025 JPY Unsecured-Senior Bonds – fixed rate                  
Disclosure of detailed information about borrowings [line items]                  
Principal amount in contractual currency (millions) ¥ 184,000       ¥ 184,000        
Bonds ¥ 183,609         0      
2025 JPY Unsecured-Senior Bonds – fixed rate | Minimum                  
Disclosure of detailed information about borrowings [line items]                  
Interest rate (%) 1.599% 1.599% 1.599%            
2025 JPY Unsecured-Senior Bonds – fixed rate | Maximum                  
Disclosure of detailed information about borrowings [line items]                  
Interest rate (%) 2.292% 2.292% 2.292%            
2025 USD Unsecured Guaranteed Senior Notes – fixed rate                  
Disclosure of detailed information about borrowings [line items]                  
Principal amount in contractual currency (millions) | $   $ 2,400   $ 2,400          
Bonds ¥ 379,418         0      
2025 USD Unsecured Guaranteed Senior Notes – fixed rate | Minimum                  
Disclosure of detailed information about borrowings [line items]                  
Interest rate (%) 5.20% 5.20% 5.20%            
2025 USD Unsecured Guaranteed Senior Notes – fixed rate | Maximum                  
Disclosure of detailed information about borrowings [line items]                  
Interest rate (%) 5.90% 5.90% 5.90%            
Commercial Paper                  
Disclosure of detailed information about borrowings [line items]                  
Principal amount in contractual currency (millions)           270,000      
Bonds ¥ 0         ¥ 270,000      
Interest rate (%) 0.00% 0.00% 0.00%