Impairment Charges on Financial Assets - Summary of Impairment Charges (Reversals) on Financial Assets (Detail) - JPY (¥) ¥ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Disclosure of impairment loss and reversal of impairment loss [line items] | |||
| Impairment charges on financial assets | ¥ 392,157 | ¥ 411,278 | ¥ 205,096 |
| Loans and advances [member] | |||
| Disclosure of impairment loss and reversal of impairment loss [line items] | |||
| Impairment charges on financial assets | 384,150 | 378,791 | 222,894 |
| Loan commitments [member] | |||
| Disclosure of impairment loss and reversal of impairment loss [line items] | |||
| Impairment charges on financial assets | (4,877) | 18,162 | (13,875) |
| Financial guarantees [member] | |||
| Disclosure of impairment loss and reversal of impairment loss [line items] | |||
| Impairment charges on financial assets | (247) | 14,030 | (3,923) |
| Investment securities [member] | |||
| Disclosure of impairment loss and reversal of impairment loss [line items] | |||
| Impairment charges on financial assets | ¥ 13,131 | ¥ 295 | |