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Derivative Financial Instruments and Hedging (Derivative instruments fair value hedge assets and liabilities) (Detail) - JPY (¥) ¥ in Millions | Mar. 31, 2023 | Mar. 31, 2022
--- | --- | ---
Investment in Securities [Member] |  |
Statement [Line Items] |  |
Carrying amount | ¥ 470,204 | ¥ 422,938
The cumulative amount of fair value hedging adjustments included in the carrying amount | (1,107) | 1,147
Carrying amount | 0 | 0
The cumulative amount of fair value hedging adjustments included in the carrying amount | 0 | 0
Installment Loans [Member] |  |
Statement [Line Items] |  |
Carrying amount | 13,969 | 28,836
The cumulative amount of fair value hedging adjustments included in the carrying amount | (1) | 55
Carrying amount | 0 | 0
The cumulative amount of fair value hedging adjustments included in the carrying amount | ¥ 0 | ¥ 0

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- Definition Amount of asset hedged in fair value hedging relationship. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959 + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959 + Details
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- Definition Amount of liability hedged in fair value hedging relationship. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959 + Details
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- Definition Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959 + Details
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