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Investment in Securities (Summary of Investment in Securities) (Parenthetical) (Detail) - JPY (¥) ¥ in Millions		Mar. 31, 2025	Mar. 31, 2024
Schedule of Investments [Line Items]
Equity securities		¥ 41,018	¥ 35,696
Equity securities	[1]	626,910	597,601
Investment Funds Elected for Fair Value Option
Schedule of Investments [Line Items]
Equity securities		24,960	26,945
Variable Annuity and Variable Life Insurance Contracts
Schedule of Investments [Line Items]
Equity securities		¥ 132,313	¥ 161,244
[1] The amount of assets under management of variable annuity and variable life insurance contracts included in equity securities were ¥161,244 million and ¥132,313 million as of March 31, 2024 and 2025, respectively. The amount of investment funds and others elected the fair value option included in equity securities were ¥26,945 million and ¥24,960 million as of March 31, 2024 and 2025, respectively.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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