Financial Instruments - Schedule of Carrying Amount of Assets Pledged as Collateral (Parenthetical) (Details) - JPY (¥) ¥ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
|---|---|---|
| Disclosure of financial assets [line items] | ||
| Loans and advances to customers | ¥ 2,512,851 | ¥ 1,927,607 |
| Borrowings From Securitization Backed | ||
| Disclosure of financial assets [line items] | ||
| Loans and advances to customers | ¥ 55,000 | ¥ 55,000 |