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Life Insurance Operations - Additional Information (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Net Investment Income [Line Items]
Amortization of policy acquisition costs charged to income	¥ 25,966	¥ 21,213	¥ 21,928

X

- Definition

Amount of amortization expense (reversal of expense) for deferred policy acquisition costs.

+ References

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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