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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) (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 |
Interest rate swap agreements | Derivatives designated as hedging instruments and other |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional amount | 676,691 |  | 518,990 |
Interest rate swap agreements | Derivatives designated as hedging instruments and other | Other assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative assets, Fair value | 17,788 |  | 18,889 |
Interest rate swap agreements | Derivatives designated as hedging instruments and other | Other liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative liabilities, Fair value | 2,768 |  | 3,722 |
Interest rate swap agreements | Derivatives not designated as hedging instruments |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional amount | 1,477 |  | 1,930 |
Interest rate swap agreements | Derivatives not designated as hedging instruments | Other assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative assets, Fair value | 81 |  | 106 |
Interest rate swap agreements | Derivatives not designated as hedging instruments | Other liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative liabilities, Fair value | 6 |  | 6 |
Options held/written and other | Derivatives designated as hedging instruments and other |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional amount | 94,608 |  | 44,774 |
Options held/written and other | Derivatives designated as hedging instruments and other | Other assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative assets, Fair value | 98 |  | 40 |
Options held/written and other | Derivatives designated as hedging instruments and other | Other liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative liabilities, Fair value | 7,323 |  | 1,039 |
Options held/written and other | Derivatives not designated as hedging instruments |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional amount | 582,939 |  | 468,422 |
Options held/written and other | Derivatives not designated as hedging instruments | Other assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative assets, Fair value | 15,669 |  | 15,309 |
Options held/written and other | Derivatives not designated as hedging instruments | Other liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative liabilities, Fair value | 6,392 |  | 13,355 |
Futures, foreign exchange contracts | Derivatives designated as hedging instruments and other |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional amount | 932,649 |  | 958,260 |
Futures, foreign exchange contracts | Derivatives designated as hedging instruments and other | Other assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative assets, Fair value | 9,515 |  | 2,841 |
Futures, foreign exchange contracts | Derivatives designated as hedging instruments and other | Other liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative liabilities, Fair value | 25,445 |  | 63,703 |
Futures, foreign exchange contracts | Derivatives not designated as hedging instruments |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional amount | 1,592,590 | [1] | 646,085 | [2]
Futures, foreign exchange contracts | Derivatives not designated as hedging instruments | Other assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative assets, Fair value | 11,449 | [1] | 35,331 | [2]
Futures, foreign exchange contracts | Derivatives not designated as hedging instruments | Other liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative liabilities, Fair value | 13,942 | [1] | 7,294 | [2]
Foreign currency swap agreements | Derivatives designated as hedging instruments and other |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional amount | 303,060 |  | 113,962 |
Foreign currency swap agreements | Derivatives designated as hedging instruments and other | Other assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative assets, Fair value | 9,570 |  | 470 |
Foreign currency swap agreements | Derivatives designated as hedging instruments and other | Other liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative liabilities, Fair value | 159 |  | 6,563 |
Foreign currency long-term debt | Derivatives designated as hedging instruments and other |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional amount | 250,702 |  | 849,630 |
Foreign currency long-term debt | Derivatives designated as hedging instruments and other | Other assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative assets, Fair value | 0 |  | 0 |
Foreign currency long-term debt | Derivatives designated as hedging instruments and other | Other liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative liabilities, Fair value | 0 |  | 0 |
Credit derivatives written | Derivatives not designated as hedging instruments |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Notional amount | 1,000 |  | 1,000 |
Credit derivatives written | Derivatives not designated as hedging instruments | Other assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative assets, Fair value | 0 |  | 0 |
Credit derivatives written | Derivatives not designated as hedging instruments | Other liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative liabilities, Fair value | ¥ 3 |  | ¥ 4 |
[1] | The notional amounts of futures and foreign exchange contracts in the above table include futures contracts of ¥0 million and foreign exchange contracts of ¥0 million to economically hedge the minimum guarantee risk of variable annuity and variable life insurance contracts at March 31, 2025, respectively. Derivative assets in the above table include fair value of the futures and foreign exchange contracts before offsetting of ¥0 million and ¥0 million and derivative liabilities include fair value of the futures and foreign exchange contracts before offsetting of ¥0 million and ¥0 million at March 31, 2025, respectively.
[2] | The notional amounts of futures and foreign exchange contracts in the above table include futures contracts of ¥4,863 million and foreign exchange contracts of ¥524 million to economically hedge the minimum guarantee risk of variable annuity and variable life insurance contracts at March 31, 2024, respectively. Derivative assets in the above table include fair value of the futures and foreign exchange contracts before offsetting of ¥0 million and ¥9 million and derivative liabilities include fair value of the futures and foreign exchange contracts before offsetting of ¥170 million and ¥94 million at March 31, 2024, respectively.

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