v3.26.1
Financial Instruments - Schedule of Carrying Amount of Assets Pledged as Collateral (Details) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Disclosure of financial assets [line items]    
Guarantee deposits ¥ 74,139 ¥ 244,229
Loans and advances to customers 2,512,851 1,927,607
Securities 1,736,835 1,075,748
Other 32,293 23,130
Total financial assets 3,071,287 2,146,595
Assets Pledged as Collateral    
Disclosure of financial assets [line items]    
Guarantee deposits 1,980 2,133
Loans and advances to customers 30,999 30,982
Securities 605,904 249,056
Other 5,162 3,713
Total financial assets ¥ 644,045 ¥ 285,884