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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
		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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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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