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Derivative Financial Instruments and Hedging (Derivative instruments fair value hedge assets and liabilities) (Detail) - JPY (¥) ¥ in Millions | Mar. 31, 2025 | Mar. 31, 2024
--- | --- | ---
Investment in Securities |  |
Carrying amount | ¥ 491,447 | ¥ 489,908
The cumulative amount of fair value hedging adjustments included in the carrying amount | 0 | (1,088)
Carrying amount | 28,220 |
The cumulative amount of fair value hedging adjustments included in the carrying amount | ¥ 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 |  |
Carrying amount | ¥ 22,451 | ¥ 15,882
The cumulative amount of fair value hedging adjustments included in the carrying amount | (92) | 0
Carrying amount |  |
The cumulative amount of fair value hedging adjustments included in the carrying amount |  |
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

X
- 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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