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Derivative Financial Instruments and Hedging (Notional Amounts of Derivative Instruments and Other, Fair Values of Derivative Instruments and Other before Offsetting) (Parenthetical) (Detail) - JPY (¥) ¥ in Millions | Sep. 30, 2025 | Mar. 31, 2025
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative assets Fair value | ¥ 84,038 | ¥ 64,170
Derivative liabilities Fair value | 74,391 | 56,038
Futures | Variable Annuity and Variable Life Insurance Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount | 2,629 | 5,575
Derivative assets Fair value | 1 | 38
Derivative liabilities Fair value | 33 | 57
Foreign exchange contracts | Variable Annuity and Variable Life Insurance Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount | 1,662 | 2,205
Derivative assets Fair value | 6 | 38
Derivative liabilities Fair value | ¥ 42 | ¥ 11

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