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v3.25.2

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, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Net Investment Income [Line Items] |  |  |  |
Total revenue |  | ¥ 2,874,821 | ¥ 2,814,361 | ¥ 2,663,659
Life insurance premiums |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total revenue |  | 481,432 | 459,655 | 451,404
Life insurance related investment income |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total revenue | [1] | 33,827 | 99,268 | 42,666
Life insurance premiums and related investment income |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total revenue |  | ¥ 515,259 | ¥ 558,923 | ¥ 494,070
[1] | Life insurance related investment income in fiscal 2023, 2024 and 2025 include net unrealized holding gains of 851 million, ¥43,301 million and ¥997 million on equity securities held as of March 31, 2023, 2024 and 2025, 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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