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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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- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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