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Fair Value Measurements (Recorded Amounts of Major Assets Measured at Fair Value on Nonrecurring Basis) (Detail) - JPY (¥) ¥ in Millions | Mar. 31, 2024 | Mar. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | ¥ 129,959 | ¥ 197,041
Fair Value, Measurements, Nonrecurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | 1,706 | 1,139
Real estate collateral-dependent loans (net of allowance for credit losses) | 5,535 | 5,970
Investment in operating leases and property under facility operations | 1,205 | 4,568
Certain equity securities | 18,484 | 11,794
Certain equity method investments | 461 | 4,013
Assets measured at fair value on a nonrecurring basis | 27,391 | 27,484
Fair Value, Measurements, Nonrecurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | 0 | 0
Real estate collateral-dependent loans (net of allowance for credit losses) | 0 | 0
Investment in operating leases and property under facility operations | 0 | 0
Certain equity securities | 0 | 0
Certain equity method investments | 0 | 3,587
Assets measured at fair value on a nonrecurring basis | 0 | 3,587
Fair Value, Measurements, Nonrecurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | 1,706 | 1,139
Real estate collateral-dependent loans (net of allowance for credit losses) | 261 | 0
Investment in operating leases and property under facility operations | 0 | 31
Certain equity securities | 18,484 | 11,794
Certain equity method investments | 0 | 0
Assets measured at fair value on a nonrecurring basis | 20,451 | 12,964
Fair Value, Measurements, Nonrecurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | 0 | 0
Real estate collateral-dependent loans (net of allowance for credit losses) | 5,274 | 5,970
Investment in operating leases and property under facility operations | 1,205 | 4,537
Certain equity securities | 0 | 0
Certain equity method investments | 461 | 426
Assets measured at fair value on a nonrecurring basis | ¥ 6,940 | ¥ 10,933

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