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Investment in Securities (Summary of Investment in Securities) (Parenthetical) (Detail) - JPY (¥) ¥ in Millions | Mar. 31, 2023 | Mar. 31, 2022
--- | --- | ---
Schedule of Investments [Line Items] |  |  |
Equity securities |  | ¥ 22,874 | ¥ 19,353
Equity securities | [1] | 589,312 | 560,643
Investment Funds Elected for Fair Value Option |  |  |
Schedule of Investments [Line Items] |  |  |
Equity securities |  | 16,032 | 11,709
Variable Annuity and Variable Life Insurance Contracts |  |  |
Schedule of Investments [Line Items] |  |  |
Equity securities |  | 151,445 | 185,115
Investment funds that are accounted for under the equity method |  |  |
Schedule of Investments [Line Items] |  |  |
Equity securities |  | ¥ 90,993 | ¥ 90,650
[1] | The amount of assets under management of variable annuity and variable life insurance contracts included in equity securities were ¥185,115 million and ¥151,445 million as of March 31, 2022 and 2023, respectively. The amount of investment funds that are accounted for under the equity method included in equity securities were ¥90,650 million and ¥ 90,993 million as of March 31, 2022 and 2023, respectively. The amount of investment funds and others elected the fair value option included in equity securities were ¥11,709 million and ¥16,032 million as of March 31, 2022 and 2023, respectively.

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