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Derivative Financial Instruments and Hedging (Effect of Derivative Instruments on Consolidated Statements of Income, Pre-tax, Fair value hedges) (Detail) - Derivatives designated as hedging instruments - Fair value hedges - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Interest rate swap agreements | Life insurance premiums and related investment income
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income on derivative and other	¥ (216)	¥ 2,633	¥ 4,142
Gains (losses) recognized in income on hedged item	335	(2,499)	(4,068)
Interest rate swap agreements | Other (income) and expense
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income on derivative and other	0	0	0
Gains (losses) recognized in income on hedged item	0	0	0
Foreign exchange contracts | Life insurance premiums and related investment income
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income on derivative and other	(61,917)	(42,947)	(37,997)
Gains (losses) recognized in income on hedged item	62,028	43,006	37,659
Foreign exchange contracts | Other (income) and expense
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income on derivative and other	(130)	(412)	5
Gains (losses) recognized in income on hedged item	¥ 42	¥ 332	¥ 89

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- Definition

Gains (losses) recognized in income on derivative and other.

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Hedged Items, Gain (Loss) Recognized in Income, Net

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- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4E
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4E

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