v3.26.1
Financial Instruments - Schedule of Financial Assets Segregated into Credit Qualities Based on Internal Risk Assessments (Details) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Disclosure of credit risk exposure [line items]    
Financial assets ¥ 3,071,287 ¥ 2,146,595
Performing    
Disclosure of credit risk exposure [line items]    
Financial assets 3,065,985 2,143,066
Credit Watch    
Disclosure of credit risk exposure [line items]    
Financial assets 2,279 1,849
At Risk or Default    
Disclosure of credit risk exposure [line items]    
Financial assets 3,023 1,680
Financial Assets with Loss Allowance Measured at 12-month ECL    
Disclosure of credit risk exposure [line items]    
Financial assets 3,065,985 2,143,066
Financial Assets with Loss Allowance Measured at 12-month ECL | Performing    
Disclosure of credit risk exposure [line items]    
Financial assets 3,065,985 2,143,066
Financial Assets with Loss Allowance Measured at Lifetime ECL | Financial Assets with Significant Increase in Credit Risk Since Initial Recognition    
Disclosure of credit risk exposure [line items]    
Financial assets 2,279 1,849
Financial Assets with Loss Allowance Measured at Lifetime ECL | Financial Assets with Significant Increase in Credit Risk Since Initial Recognition | Credit Watch    
Disclosure of credit risk exposure [line items]    
Financial assets 2,279 1,849
Financial Assets with Loss Allowance Measured at Lifetime ECL | Credit-Impaired Financial Assets    
Disclosure of credit risk exposure [line items]    
Financial assets 3,023 1,680
Financial Assets with Loss Allowance Measured at Lifetime ECL | Credit-Impaired Financial Assets | At Risk or Default    
Disclosure of credit risk exposure [line items]    
Financial assets ¥ 3,023 ¥ 1,680