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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 | 6 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
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 | ¥ 0 | ¥ 138
Gains (losses) recognized in income on hedged item | 0 | (92)
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 | (36) | 40
Gains (losses) recognized in income on hedged item | (62) | (13)
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 | 5,252 | (22,854)
Gains (losses) recognized in income on hedged item | (5,217) | 22,944
Foreign exchange contracts | Interest expense |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) recognized in income on derivative and other | 630 |
Foreign exchange contracts | Other (income) and expense |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) recognized in income on derivative and other | (2,995) | 142
Gains (losses) recognized in income on hedged item | ¥ 1,380 | ¥ (237)

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- Definition Line items represent financial concepts included in a table. 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