Lease Transactions (Narrative) (Detail) - JPY (¥) ¥ in Millions |
12 Months Ended | |
|---|---|---|
Mar. 31, 2022 |
Mar. 31, 2021 |
|
| Leases [Abstract] | ||
| Right-of-use assets of finance leases | ¥ 12,980 | ¥ 15,218 |
| Lease liabilities of finance leases | 16,104 | 20,137 |
| Right-of-use assets of operating leases | 261,803 | 338,547 |
| Amount on balance sheet | 384,183 | 476,104 |
| Operating Lease, Impairment Loss | ¥ 20,830 | ¥ 56,424 |
| Right-of-use assets of finance leases, in consolidated balance sheets line item | Premises and equipment—net (Notes 5 and 7) | Premises and equipment—net (Notes 5 and 7) |
| Lease liabilities of finance leases, in consolidated balance sheets line item | Long-term debt (including ¥402,823 and ¥483,051 measured at fair value under the fair value option in 2021 and 2022) (Notes 7, 9, 12 and 31) | Long-term debt (including ¥402,823 and ¥483,051 measured at fair value under the fair value option in 2021 and 2022) (Notes 7, 9, 12 and 31) |
| Right-of-use assets of operating leases, in consolidated balance sheets line item | Other Assets | Other Assets |
| Lease liabilities of operating leases, in consolidated balance sheets line item | Other Liabilities | Other Liabilities |