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Investment in Securities (Summary of Investment in Securities) (Parenthetical) (Detail) - JPY (¥) ¥ in Millions		Mar. 31, 2023	Mar. 31, 2022
Schedule of Investments [Line Items]
Equity securities		¥ 22,874	¥ 19,353
Equity securities	[1]	589,312	560,643
Investment Funds Elected for Fair Value Option
Schedule of Investments [Line Items]
Equity securities		16,032	11,709
Variable Annuity and Variable Life Insurance Contracts
Schedule of Investments [Line Items]
Equity securities		151,445	185,115
Investment funds that are accounted for under the equity method
Schedule of Investments [Line Items]
Equity securities		¥ 90,993	¥ 90,650
[1] The amount of assets under management of variable annuity and variable life insurance contracts included in equity securities were ¥185,115 million and ¥151,445 million as of March 31, 2022 and 2023, respectively. The amount of investment funds that are accounted for under the equity method included in equity securities were ¥90,650 million and ¥ 90,993 million as of March 31, 2022 and 2023, respectively. The amount of investment funds and others elected the fair value option included in equity securities were ¥11,709 million and ¥16,032 million as of March 31, 2022 and 2023, respectively.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(2))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
-Paragraph 1
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-URI https://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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