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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, 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.

X

- Definition

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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