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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 | Mar. 31, 2025 | Mar. 31, 2024
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative assets Fair value | ¥ 64,170 | ¥ 72,986
Derivative liabilities Fair value | 56,038 | 95,686
Futures | Variable Annuity and Variable Life Insurance Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount | 5,575 | 4,863
Derivative assets Fair value | 38 | 0
Derivative liabilities Fair value | 57 | 170
Foreign exchange contracts | Variable Annuity and Variable Life Insurance Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount | 2,205 | 524
Derivative assets Fair value | 38 | 9
Derivative liabilities Fair value | ¥ 11 | ¥ 94

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