v3.25.2
Fair Value (Narrative) (Details) - Level 3
Mar. 31, 2025
JPY (¥)
Mar. 31, 2024
JPY (¥)
Minimum | Price    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Loans held for sale, measurement input 4.21 6.67
Minimum | Discount factor    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Loans held for sale, measurement input 0.0083 0.0130
Maximum | Price    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Loans held for sale, measurement input 100.00 100.00
Maximum | Discount factor    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Loans held for sale, measurement input 0.1187 0.0229
Weighted average | Price    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Loans held for sale, measurement input 83.38 95.38
Weighted average | Discount factor    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Loans held for sale, measurement input 0.1151 0.0175