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Derivative Financial Instruments and Hedging (Derivative instruments fair value hedge assets and liabilities) (Detail) - JPY (¥) ¥ in Millions | Mar. 31, 2024 | Mar. 31, 2023
--- | --- | ---
Investment in Securities [Member] |  |
Carrying amount | ¥ 489,908 | ¥ 470,204
The cumulative amount of fair value hedging adjustments included in the carrying amount | (1,088) | (1,107)
Carrying amount | 0 | 0
The cumulative amount of fair value hedging adjustments included in the carrying amount | ¥ 0 | ¥ 0
Hedged Asset, Statement of Financial Position [Extensible Enumeration] | Investment in Securities | Investment in Securities
Hedged Liability, Statement of Financial Position [Extensible Enumeration] | Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense | Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense
Installment Loans [Member] |  |
Carrying amount | ¥ 15,882 | ¥ 13,969
The cumulative amount of fair value hedging adjustments included in the carrying amount | 0 | (1)
Carrying amount | 0 | 0
The cumulative amount of fair value hedging adjustments included in the carrying amount | ¥ 0 | ¥ 0
Hedged Asset, Statement of Financial Position [Extensible Enumeration] | Investment in Securities | Investment in Securities
Hedged Liability, Statement of Financial Position [Extensible Enumeration] | Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense | Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense

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- Definition Amount of asset hedged in fair value hedging relationship. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 181 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480401/815-10-55-181 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4EE -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4EE + Details
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- Definition Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 181 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480401/815-10-55-181 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4EE -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4EE + Details
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