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v3.25.2

Investment in Securities (Summary of Roll-forwards of Allowance for Credit Losses) (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Accounts And Financing Receivable For Credit Losses [Line Items] |  |  |
Beginning | ¥ 634 | ¥ 144 | ¥ 153
Additions to the allowance for credit losses on available-for-sale debt securities for which credit losses were not previously recorded | 141 | 445 |
Additional increases to the allowance for credit losses on available-for-sale debt securities that had an allowance recorded in a previous period | 32 |  |
Additional increases (decreases) to the allowance for credit losses on AFS debt securities that had an allowance recorded in a previous period, net |  |  | (21)
Increase (Decrease) from the effects of changes in foreign exchange rates | (137) | 45 | 12
Ending | 670 | 634 | 144
Foreign municipal bond securities |  |  |
Accounts And Financing Receivable For Credit Losses [Line Items] |  |  |
Beginning | 248 | 144 | 132
Additions to the allowance for credit losses on available-for-sale debt securities for which credit losses were not previously recorded | 0 | 80 |
Additional increases to the allowance for credit losses on available-for-sale debt securities that had an allowance recorded in a previous period | 0 |  |
Additional increases (decreases) to the allowance for credit losses on AFS debt securities that had an allowance recorded in a previous period, net |  |  | 0
Increase (Decrease) from the effects of changes in foreign exchange rates | (3) | 24 | 12
Ending | 245 | 248 | 144
Japanese other asset- backed securities and debt securities |  |  |
Accounts And Financing Receivable For Credit Losses [Line Items] |  |  |
Beginning |  | 0 | 21
Additional increases (decreases) to the allowance for credit losses on AFS debt securities that had an allowance recorded in a previous period, net |  |  | (21)
Increase (Decrease) from the effects of changes in foreign exchange rates |  |  | 0
Ending |  |  | 0
Foreign corporate debt securities |  |  |
Accounts And Financing Receivable For Credit Losses [Line Items] |  |  |
Beginning | 0 |  |
Additions to the allowance for credit losses on available-for-sale debt securities for which credit losses were not previously recorded | 34 |  |
Additional increases to the allowance for credit losses on available-for-sale debt securities that had an allowance recorded in a previous period | 0 |  |
Increase (Decrease) from the effects of changes in foreign exchange rates | 0 |  |
Ending | 34 | 0 |
Foreign other asset- backed securities and debt securities |  |  |
Accounts And Financing Receivable For Credit Losses [Line Items] |  |  |
Beginning | 386 | 0 |
Additions to the allowance for credit losses on available-for-sale debt securities for which credit losses were not previously recorded | 107 | 365 |
Additional increases to the allowance for credit losses on available-for-sale debt securities that had an allowance recorded in a previous period | 32 |  |
Increase (Decrease) from the effects of changes in foreign exchange rates | (134) | 21 |
Ending | ¥ 391 | ¥ 386 | ¥ 0

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