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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