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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 | Sep. 30, 2023 JPY (¥) | Mar. 31, 2023 JPY (¥)
--- | --- | ---
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 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 investment in affiliates |  | 4,013
Assets, Fair Value Disclosure | 27,240 | 27,484
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 investment in affiliates |  | 426
Assets, Fair Value Disclosure | 4,296 | 10,933
Fair Value, Measurements, Nonrecurring | Loans Held-for-Sale | Level 3 | Discounted cash flows |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | ¥ 91 |
Fair Value, Measurements, Nonrecurring | Loans Held-for-Sale | Level 3 | Minimum | Discounted cash flows | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range Discount Rate | 0.099 |
Fair Value, Measurements, Nonrecurring | Loans Held-for-Sale | Level 3 | Maximum | Discounted cash flows | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range Discount Rate | 0.101 |
Fair Value, Measurements, Nonrecurring | Loans Held-for-Sale | 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 | 0.10 |
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) | ¥ 1,324 | 1,351
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) | ¥ 2,401 | ¥ 4,619
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] |  |
Significant unobservable inputs, Real estate collateral-dependent loans (net of allowance for credit losses) | 0.049 | 0.047
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] |  |
Significant unobservable inputs, Real estate collateral-dependent loans (net of allowance for credit losses) | 0.066 | 0.066
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] |  |
Significant unobservable inputs, Real estate collateral-dependent loans (net of allowance for credit losses) | 0.054 | 0.055
Fair Value, Measurements, Nonrecurring | Investment in operating leases and property under facility operations | 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 | ¥ 50 |
Fair Value, Measurements, Nonrecurring | Investment in operating leases and property under facility operations | 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 | ¥ 430 |
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, property under facility operations, office facilities and other assets |  | ¥ 3,257
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, property under facility operations, office facilities and other assets |  | ¥ 1,280
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] |  |
Significant unobservable inputs, Investment in operating leases, property under facility operations, office facilities and other assets |  | 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] |  |
Significant unobservable inputs, Investment in operating leases, property under facility operations, office facilities and other assets |  | 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] |  |
Significant unobservable inputs, Investment in operating leases, property under facility operations, office facilities and other assets |  | 0.049
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] |  |
Significant unobservable inputs, Certain investment in affiliates |  | 0.037
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
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] |  |
Significant unobservable inputs, Certain investment in affiliates |  | 0.037
Fair Value, Measurements, Nonrecurring | Investment in operating leases and property under facility operations | Level 3 | Discounted cash flows | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Significant unobservable inputs, Investment in operating leases and property under facility operations | 0.13 |
Fair Value, Measurements, Nonrecurring | Investment in operating leases and property under facility operations | Level 3 | Weighted Average | Discounted cash flows | Discount rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Significant unobservable inputs, Investment in operating leases and property under facility operations | 0.13 |

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