v3.26.1
Financial Instruments - Narrative (Details)
¥ in Millions
12 Months Ended
Mar. 31, 2026
JPY (¥)
Mar. 31, 2025
JPY (¥)
Oct. 03, 2024
JPY (¥)
Jun. 25, 2024
JPY (¥)
Disclosure of detailed information about financial instruments [line items]        
Cumulative gain on equity investments reclassified from other comprehensive income to retained earnings upon disposal ¥ (12,205) ¥ (1,339)    
Fair value of equity investments on dates of disposal 2,138 25,019    
2024 Hybrid bonds (subordinated bonds)        
Disclosure of detailed information about financial instruments [line items]        
Principal amount in contractual currency (millions) 460,000     ¥ 460,000
Principal amount in contractual currency (millions)   460,000    
2024 Syndicated Hybrid Loans (Subordinated Loans)        
Disclosure of detailed information about financial instruments [line items]        
Principal amount in contractual currency (millions)     ¥ 40,000  
Principal amount in contractual currency (millions) 40,000      
Foreign currency denominated loans        
Disclosure of detailed information about financial instruments [line items]        
Fair value   74,517    
Foreign currency denominated bonds        
Disclosure of detailed information about financial instruments [line items]        
Fair value ¥ 3,417,873 ¥ 2,892,158    
Minimum        
Disclosure of detailed information about financial instruments [line items]        
Measurement input, EBITDA rate 4.3      
Maximum        
Disclosure of detailed information about financial instruments [line items]        
Measurement input, EBITDA rate 7.9