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Derivative Financial Instruments and Hedging (Effect of Derivative Instruments on Consolidated Statements of Income, Pre-tax, Fair value hedges) (Detail) - Derivatives designated as hedging instruments - Fair value hedges - JPY (¥) ¥ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Interest rate swap agreements | Life insurance premiums and related investment income |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in income on derivative and other | ¥ 79 | ¥ 1,305 | ¥ 371 | ¥ 3,173
Gains (losses) recognized in income on hedged item | (76) | (1,309) | (227) | (3,058)
Interest rate swap agreements | Other (income) and expense |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in income on derivative and other | 0 | 0 | 0 | 0
Gains (losses) recognized in income on hedged item | 11 | 0 | 11 | 0
Foreign exchange contracts | Life insurance premiums and related investment income |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in income on derivative and other | (13,560) | (29,199) | (55,247) | (78,667)
Gains (losses) recognized in income on hedged item | 13,603 | 29,275 | 55,301 | 78,817
Foreign exchange contracts | Other (income) and expense |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in income on derivative and other | 52 | (314) | (101) | (449)
Gains (losses) recognized in income on hedged item | ¥ (35) | ¥ 218 | ¥ 48 | ¥ 399

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- Definition Gains (losses) recognized in income on derivative and other. + References No definition available. + Details
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- Definition Hedged Items, Gain (Loss) Recognized in Income, Net + References No definition available. + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4E + Details
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