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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, 2024 | Mar. 31, 2023
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative assets Fair value | ¥ 72,986 | ¥ 72,398
Derivative liabilities Fair value | 95,686 | 71,366
Futures | Variable Annuity and Variable Life Insurance Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount | 4,863 | 14,758
Derivative assets Fair value | 0 | 52
Derivative liabilities Fair value | 170 | 200
Foreign exchange contracts | Variable Annuity and Variable Life Insurance Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount | 524 | 5,554
Derivative assets Fair value | 9 | 12
Derivative liabilities Fair value | ¥ 94 | ¥ 179

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