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Fair Value Measurements (Recorded Amounts of Major Assets Measured at Fair Value on Nonrecurring Basis) (Detail) - JPY (¥) ¥ in Millions | Sep. 30, 2023 | Mar. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | ¥ 149,390 | ¥ 197,041
Certain investment in affiliates | 5,003 | 2,511
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Certain investment in affiliates | 0 | 0
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Certain investment in affiliates | 0 | 0
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Certain investment in affiliates | 5,003 | 2,511
Fair Value, Measurements, Nonrecurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | 10,542 | 1,139
Real estate collateral-dependent loans (net of allowance for credit losses) | 3,725 | 5,970
Investment in operating leases, property under facility operations, office facilities and other assets |  | 4,568
Investment in operating leases and property under facility operations | 480 |
Certain equity securities | 12,493 | 11,794
Certain investment in affiliates |  | 4,013
Assets measured at fair value on a nonrecurring basis | 27,240 | 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, property under facility operations, office facilities and other assets |  | 0
Investment in operating leases and property under facility operations | 0 |
Certain equity securities | 0 | 0
Certain investment in affiliates |  | 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 | 10,451 | 1,139
Real estate collateral-dependent loans (net of allowance for credit losses) | 0 | 0
Investment in operating leases, property under facility operations, office facilities and other assets |  | 31
Investment in operating leases and property under facility operations | 0 |
Certain equity securities | 12,493 | 11,794
Certain investment in affiliates |  | 0
Assets measured at fair value on a nonrecurring basis | 22,944 | 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 | 91 | 0
Real estate collateral-dependent loans (net of allowance for credit losses) | 3,725 | 5,970
Investment in operating leases, property under facility operations, office facilities and other assets |  | 4,537
Investment in operating leases and property under facility operations | 480 |
Certain equity securities | 0 | 0
Certain investment in affiliates |  | 426
Assets measured at fair value on a nonrecurring basis | ¥ 4,296 | ¥ 10,933

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