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Derivative Financial Instruments and Hedging (Derivative instruments fair value hedge assets and liabilities) (Detail) - JPY (¥) ¥ in Millions | Sep. 30, 2025 | Mar. 31, 2025
--- | --- | ---
Investment in Securities |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Carrying amount, Assets as hedged items in fair value hedges | ¥ 593,523 | ¥ 491,447
The cumulative amount of fair value hedging adjustments included in the carrying amount, Assets as hedged items in fair value hedges | ¥ 1,634 | ¥ 0
Hedged Asset, Statement of Financial Position [Extensible Enumeration] | Investment in securities | Investment in securities
Installment Loans |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Carrying amount, Assets as hedged items in fair value hedges | ¥ 6,646 | ¥ 22,451
The cumulative amount of fair value hedging adjustments included in the carrying amount, Assets as hedged items in fair value hedges | ¥ (51) | ¥ (92)
Hedged Asset, Statement of Financial Position [Extensible Enumeration] | Investment in securities | Investment in securities
Long-Term Debt [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Carrying amount, Liabilities as hedged items in fair value hedges | ¥ 25,900 | ¥ 28,220
The cumulative amount of fair value hedging adjustments included in the carrying amount, Liabilities as hedged items in fair value hedges | ¥ 0 | ¥ 0
Hedged Liability, Statement of Financial Position [Extensible Enumeration] | Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense |

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