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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 | 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
Interest rate swap agreements | Derivatives designated as hedging instruments and other |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount | 660,629 | 676,691
Interest rate swap agreements | Derivatives designated as hedging instruments and other | Other assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, Fair value | 17,766 | 17,788
Interest rate swap agreements | Derivatives designated as hedging instruments and other | Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities, Fair value | 2,843 | 2,768
Interest rate swap agreements | Derivatives not designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount | 1,303 | 1,477
Interest rate swap agreements | Derivatives not designated as hedging instruments | Other assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, Fair value | 75 | 81
Interest rate swap agreements | Derivatives not designated as hedging instruments | Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities, Fair value | 2 | 6
Options held/written and other | Derivatives designated as hedging instruments and other |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount | 85,362 | 94,608
Options held/written and other | Derivatives designated as hedging instruments and other | Other assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, Fair value | 7 | 98
Options held/written and other | Derivatives designated as hedging instruments and other | Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities, Fair value | 12,589 | 7,323
Options held/written and other | Derivatives not designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount | 779,487 | 582,939
Options held/written and other | Derivatives not designated as hedging instruments | Other assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, Fair value | 15,871 | 15,669
Options held/written and other | Derivatives not designated as hedging instruments | Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities, Fair value | 7,029 | 6,392
Futures, foreign exchange contracts | Derivatives designated as hedging instruments and other |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount | 947,525 | 932,649
Futures, foreign exchange contracts | Derivatives designated as hedging instruments and other | Other assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, Fair value | 2,661 | 9,515
Futures, foreign exchange contracts | Derivatives designated as hedging instruments and other | Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities, Fair value | 36,648 | 25,445
Futures, foreign exchange contracts | Derivatives not designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount | 1,496,880 | 1,592,590
Futures, foreign exchange contracts | Derivatives not designated as hedging instruments | Other assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, Fair value | 31,552 | 11,449
Futures, foreign exchange contracts | Derivatives not designated as hedging instruments | Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities, Fair value | 14,706 | 13,942
Foreign currency swap agreements | Derivatives designated as hedging instruments and other |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount | 461,350 | 303,060
Foreign currency swap agreements | Derivatives designated as hedging instruments and other | Other assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, Fair value | 16,098 | 9,570
Foreign currency swap agreements | Derivatives designated as hedging instruments and other | Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities, Fair value | 573 | 159
Foreign currency long-term debt | Derivatives designated as hedging instruments and other |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount | 92,444 | 250,702
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 held/written | Derivatives not designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount | 1,357 | 1,000
Credit derivatives held/written | Derivatives not designated as hedging instruments | Other assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, Fair value | 8 | 0
Credit derivatives held/written | Derivatives not designated as hedging instruments | Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities, Fair value | ¥ 1 | ¥ 3

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