v3.25.2
Financial Instruments - Narrative (Details)
¥ in Millions
12 Months Ended
Mar. 31, 2025
JPY (¥)
Mar. 31, 2024
JPY (¥)
Oct. 06, 2024
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 ¥ (1,339) ¥ (1,224)      
Fair value of equity investments on dates of disposal 25,019 6,458      
2019 Hybrid bonds (subordinated bonds)          
Disclosure of detailed information about financial instruments [line items]          
Principal amount in contractual currency (millions) 500,000   ¥ 500,000    
2024 Hybrid bonds (subordinated bonds)          
Disclosure of detailed information about financial instruments [line items]          
Principal amount in contractual currency (millions) 460,000       ¥ 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 74,517 227,309      
Foreign currency denominated bonds          
Disclosure of detailed information about financial instruments [line items]          
Fair value ¥ 2,892,158 ¥ 2,679,660      
Minimum          
Disclosure of detailed information about financial instruments [line items]          
Measurement input, EBITDA rate 4.7        
Maximum          
Disclosure of detailed information about financial instruments [line items]          
Measurement input, EBITDA rate 10.5