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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 | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Foreign exchange contracts | Life insurance premiums and related investment income |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in income | ¥ (6,578) | ¥ (2,155) | ¥ (10,635) | ¥ (1,474)
Foreign exchange contracts | Interest expense |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in income | 9 | 7 | 17 | 14
Foreign exchange contracts | Other (income) and expense |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in income | 0 | 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 | 0
Options held/written and other | Interest expense |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in income | 0 | 0 | 0 | 0
Options held/written and other | Other (income) and expense |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in income | ¥ 10 | ¥ 14 | ¥ 25 | ¥ 27

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