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Life Insurance Operations - Life Insurance Premiums and Related Investment Income (Parenthetical) (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Net Investment Income [Line Items] |  |  |
Trading Securities, Unrealized Holding Gain (Loss) | ¥ 18,065 | ¥ 26,075 | ¥ 83,643
Life insurance related investment income |  |  |
Net Investment Income [Line Items] |  |  |
Trading Securities, Unrealized Holding Gain (Loss) | ¥ 851 | ¥ 8,004 | ¥ 61,351

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