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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) - Fair Value, Measurements, Nonrecurring ¥ in Millions | Mar. 31, 2025 JPY (¥) | Mar. 31, 2024 JPY (¥)
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Real estate collateral-dependent loans (net of allowance for credit losses) | ¥ 5,881 | ¥ 5,535
Investment in operating leases and property under facility operations |  | 1,205
Investment in operating leases, property under facility operations and office facilities | 8,105 |
Certain equity method investments | 20,619 | 461
Total | 49,798 | 27,391
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) | 5,881 | 5,274
Investment in operating leases and property under facility operations |  | 1,205
Investment in operating leases, property under facility operations and office facilities | 8,105 |
Certain equity method investments | 20,619 | 461
Total | 34,605 | 6,940
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) | 1,064 | 892
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 |  | 337
Investment in operating leases, property under facility operations and office facilities | ¥ 3,314 |
Level 3 | Discounted cash flows | Discount rate | Investment in operating leases, property under facility operations, office facilities and other assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Significant unobservable inputs, Investment in operating leases, property under facility operations | 0.061 |
Level 3 | Appraisals/Broker quotes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Real estate collateral-dependent loans (net of allowance for credit losses) | ¥ 4,817 | 4,382
Investment in operating leases and property under facility operations |  | 868
Investment in operating leases, property under facility operations and office facilities | 4,791 |
Certain equity method investments | ¥ 20,619 |
Level 3 | Market Multiples |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Certain equity method investments |  | ¥ 461
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) | 0.044 | 0.046
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 |  | 0
Level 3 | Minimum | Market Multiples | EV/EBITDA multiple |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Significant unobservable inputs, Certain equity method investments |  | 3
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) | 0.052 | 0.063
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 |  | 0.13
Level 3 | Maximum | Market Multiples | EV/EBITDA multiple |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Significant unobservable inputs, Certain equity method investments |  | 6
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) | 0.047 | 0.053
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 |  | 0.036
Level 3 | Weighted Average | Discounted cash flows | Discount rate | Investment in operating leases, property under facility operations, office facilities and other assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Significant unobservable inputs, Investment in operating leases, property under facility operations | 0.061 |
Level 3 | Weighted Average | Market Multiples | EV/EBITDA multiple |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Significant unobservable inputs, Certain equity method investments |  | 4.5

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