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Fair Value Measurements - Additional Information (Detail) - Fair Value, Measurements, Recurring - JPY (¥) ¥ in Millions | 12 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Loans Held-for-Sale |  |
Fair Value Asset And Liabilities Measured On Recurring Basis [Line Items] |  |
Transferred from level 2 to level 3 |  | ¥ 176,055
Foreign municipal bond securities |  |
Fair Value Asset And Liabilities Measured On Recurring Basis [Line Items] |  |
Transferred from level 2 to level 3 | ¥ 6,818 |

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