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Income and Expenses Relating to Life Insurance Operations - Life Insurance Premiums and Related Investment Income (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Net Investment Income [Line Items] |  |  |  |
Total revenue |  | ¥ 2,814,361 | ¥ 2,663,659 | ¥ 2,508,043
Life insurance premiums |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total revenue |  | 459,655 | 451,404 | 431,289
Life insurance related investment income |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total revenue | [1] | 99,268 | 42,666 | 50,521
Life insurance premiums and related investment income |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total revenue |  | ¥ 558,923 | ¥ 494,070 | ¥ 481,810
[1] | Life insurance related investment income in fiscal 2022, 2023 and 2024 include net unrealized holding gains of ¥8,004 million, ¥851 million and ¥43,301 million on equity securities held as of March 31, 2022, 2023 and 2024, respectively.

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. 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