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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 | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
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 | ¥ 147 | ¥ (216) | ¥ 2,633
Gains (losses) recognized in income on hedged item | (101) | 335 | (2,499)
Interest rate swap agreements | Interest expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in income on derivative and other | 0 |  |
Interest rate swap agreements | Other (income) and expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in income on derivative and other | (91) | 0 | 0
Gains (losses) recognized in income on hedged item | 92 | 0 | 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 | (6,028) | (61,917) | (42,947)
Gains (losses) recognized in income on hedged item | 6,090 | 62,028 | 43,006
Foreign exchange contracts | Interest expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in income on derivative and other | 968 |  |
Foreign exchange contracts | Other (income) and expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in income on derivative and other | (1,223) | (130) | (412)
Gains (losses) recognized in income on hedged item | ¥ 959 | ¥ 42 | ¥ 332

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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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