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Fair Value Measurements (Information about Valuation Techniques and Significant Unobservable Inputs Used in Valuation of Level Three Assets Measured at Fair Value on Nonrecurring Basis) (Detail) ¥ in Millions | Mar. 31, 2023 JPY (¥) | Mar. 31, 2022 JPY (¥)
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Certain investment in affiliates | ¥ 2,511 | ¥ 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] |  |
Real estate collateral-dependent loans (net of allowance for credit losses) | 5,970 | 6,972
Certain investment in affiliates | 4,013 | 2,846
Certain reporting units including goodwill |  | 192
Assets, Fair Value Disclosure | 27,484 | 177,557
Fair Value, Measurements, Nonrecurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Real estate collateral-dependent loans (net of allowance for credit losses) | 5,970 | 6,972
Certain investment in affiliates | 426 | 2,846
Certain reporting units including goodwill |  | 192
Assets, Fair Value Disclosure | 10,933 | 167,609
Fair Value, Measurements, Nonrecurring | Real Estate Collateral Dependent Loans | Level 3 | Direct capitalization |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Real estate collateral-dependent loans (net of allowance for credit losses) | 1,351 | 1,511
Fair Value, Measurements, Nonrecurring | Real Estate Collateral Dependent Loans | Level 3 | Appraisals |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Real estate collateral-dependent loans (net of allowance for credit losses) | ¥ 4,619 | ¥ 5,461
Fair Value, Measurements, Nonrecurring | Real Estate Collateral Dependent Loans | Level 3 | Minimum | Direct capitalization | Capitalization rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range Discount Rate | 0.047 | 0.05
Fair Value, Measurements, Nonrecurring | Real Estate Collateral Dependent Loans | Level 3 | Maximum | Direct capitalization | Capitalization rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range Discount Rate | 0.066 | 0.085
Fair Value, Measurements, Nonrecurring | Real Estate Collateral Dependent Loans | Level 3 | Weighted Average | Direct capitalization | Capitalization rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range Discount Rate | 0.055 | 0.061
Fair Value, Measurements, Nonrecurring | Investment in operating leases, property under facility operations, office facilities and other assets | Level 3 | Appraisals |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in operating leases and property under facility operations | ¥ 1,280 | ¥ 27,257
Fair Value, Measurements, Nonrecurring | Investment in operating leases, property under facility operations, office facilities and other assets | Level 3 | Discounted cash flows |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in operating leases and property under facility operations | ¥ 3,257 | ¥ 32,328
Fair Value, Measurements, Nonrecurring | Investment in operating leases, property under facility operations, office facilities and other assets | Level 3 | Discounted cash flows | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range Discount Rate |  | 0.052
Fair Value, Measurements, Nonrecurring | Investment in operating leases, property under facility operations, office facilities and other assets | Level 3 | Minimum | Discounted cash flows | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range Discount Rate | 0.005 |
Fair Value, Measurements, Nonrecurring | Investment in operating leases, property under facility operations, office facilities and other assets | Level 3 | Maximum | Discounted cash flows | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range Discount Rate | 0.058 |
Fair Value, Measurements, Nonrecurring | Investment in operating leases, property under facility operations, office facilities and other assets | Level 3 | Weighted Average | Discounted cash flows | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range Discount Rate | 0.049 | 0.052
Fair Value, Measurements, Nonrecurring | Certain Investment in Affiliates | Level 3 | Appraisals |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Certain investment in affiliates | ¥ 403 | ¥ 2,846
Fair Value, Measurements, Nonrecurring | Certain Investment in Affiliates | Level 3 | Discounted cash flows |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Certain investment in affiliates | ¥ 23 |
Fair Value, Measurements, Nonrecurring | Certain Investment in Affiliates | Level 3 | Discounted cash flows | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range Discount Rate | 0.037 |
Fair Value, Measurements, Nonrecurring | Certain Investment in Affiliates | Level 3 | Weighted Average | Discounted cash flows | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range Discount Rate | 0.037 |
Fair Value, Measurements, Nonrecurring | Certain reporting units including goodwill [Member] | Level 3 | Discounted cash flows |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Certain reporting units including goodwill |  | ¥ 192
Fair Value, Measurements, Nonrecurring | Certain reporting units including goodwill [Member] | Level 3 | Discounted cash flows | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range Discount Rate |  | 0.107
Fair Value, Measurements, Nonrecurring | Certain reporting units including goodwill [Member] | Level 3 | Weighted Average | Discounted cash flows | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range Discount Rate |  | 0.107
Fair Value, Measurements, Nonrecurring | Certain intangible assets acquired in business combinations [Member] | Level 3 | Discounted cash flows |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in operating leases and property under facility operations |  | ¥ 98,014
Fair Value, Measurements, Nonrecurring | Certain intangible assets acquired in business combinations [Member] | Level 3 | Discounted cash flows | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range Discount Rate |  | 0.109
Fair Value, Measurements, Nonrecurring | Certain intangible assets acquired in business combinations [Member] | Level 3 | Weighted Average | Discounted cash flows | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range Discount Rate |  | 0.109

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