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Gains on Investment Securities and Dividends - Gains on Investment Securities and Dividends (Detail) - JPY (¥) ¥ in Millions		12 Months Ended
		Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Net Investment Income [Line Items]
Net gains on investment securities	[1]	¥ 11,825	¥ 30,731	¥ 25,705
Dividends income		2,499	2,292	2,145
Gains on investment securities and dividends		¥ 14,324	¥ 33,023	¥ 27,850
[1] Unrealized changes in fair value of investments in equity securities have been included in “Net gains on investment securities.”

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- Definition

Total amount of gains on investment securities and dividends.

+ References

No definition available.

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- Definition

Amount of realized and unrealized gain (loss) on investment.

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-Topic 220
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-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(9)(a))
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Amount of dividend income on nonoperating securities.

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-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(a))
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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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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