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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, 2023 | Mar. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | ¥ 197,041 | ¥ 151,601
Certain investment in affiliates | 2,511 | 0
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Certain investment in affiliates | 0 |
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Certain investment in affiliates | 0 |
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Certain investment in affiliates | 2,511 |
Fair Value, Measurements, Nonrecurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | 1,139 | 235
Real estate collateral-dependent loans (net of allowance for credit losses) | 5,970 | 6,972
Investment in operating leases, property under facility operations, office facilities and other assets | 4,568 | 59,847
Certain equity securities | 11,794 | 9,451
Certain investment in affiliates | 4,013 | 2,846
Certain reporting units including goodwill |  | 192
Certain intangible assets acquired in business combinations |  | 98,014
Assets measured at fair value on a nonrecurring basis | 27,484 | 177,557
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 | 0
Certain equity securities | 0 | 0
Certain investment in affiliates | 3,587 | 0
Certain reporting units including goodwill |  | 0
Certain intangible assets acquired in business combinations |  | 0
Assets measured at fair value on a nonrecurring basis | 3,587 | 0
Fair Value, Measurements, Nonrecurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | 1,139 | 235
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 | 262
Certain equity securities | 11,794 | 9,451
Certain investment in affiliates | 0 | 0
Certain reporting units including goodwill |  | 0
Certain intangible assets acquired in business combinations |  | 0
Assets measured at fair value on a nonrecurring basis | 12,964 | 9,948
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) | 5,970 | 6,972
Investment in operating leases, property under facility operations, office facilities and other assets | 4,537 | 59,585
Certain equity securities | 0 | 0
Certain investment in affiliates | 426 | 2,846
Certain reporting units including goodwill |  | 192
Certain intangible assets acquired in business combinations |  | 98,014
Assets measured at fair value on a nonrecurring basis | ¥ 10,933 | ¥ 167,609

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