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Fair Value Measurements - Additional Information (Detail) - Fair Value, Measurements, Recurring - JPY (¥) ¥ in Millions	12 Months Ended
	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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Fair Value Asset And Liabilities Measured On Recurring Basis [Line Items]

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Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
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