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Derivative Financial Instruments and Hedging (Effect of Derivative Instruments on Consolidated Statements of Income, Pre-tax) (Detail) - Fair value hedges - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Foreign exchange contracts | Life insurance premiums and related investment income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in income | ¥ 24,143 | ¥ (25,208) | ¥ (12,299)
Foreign exchange contracts | Interest expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in income | 14 | 31 | 20
Foreign exchange contracts | Other (income) and expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in income | 0 | 0 | 0
Options held/written and other | Life insurance premiums and related investment income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in income | 0 | 0 | 0
Options held/written and other | Interest expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in income | 0 | 0 | 0
Options held/written and other | Other (income) and expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in income | ¥ 41 | ¥ 57 | ¥ 55

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