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Information about Valuation Techniques and Significant Unobservable Inputs Used in Valuation of Level Three Assets Measured at Fair Value on Nonrecurring Basis (Detail) (JPY ¥)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value ¥ 118,768 ¥ 98,073
Real Estate Collateral Dependent Loans | Discounted Cash Flows Valuation Technique
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 39,866 60,564
Valuation Technique(s) Discounted cash flows Discounted cash flows
Significant Unobservable Inputs Discount rate Discount rate
Weighted Average Discount Rate 10.20% 8.40%
Real Estate Collateral Dependent Loans | Direct Capitalization Valuation Technique
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Valuation Technique(s) Direct capitalization Direct capitalization
Significant Unobservable Inputs Capitalization rate Capitalization rate
Weighted Average Discount Rate 10.30% 10.70%
Investment in Operating Leases and Other Operating Assets | Discounted Cash Flows Valuation Technique
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 60,665 21,960
Valuation Technique(s) Discounted cash flows Discounted cash flows
Significant Unobservable Inputs Discount rate Discount rate
Weighted Average Discount Rate 5.60% 6.90%
Land And Buildings Undeveloped Or Under Construction | Discounted Cash Flows Valuation Technique
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 18,237 11,845
Valuation Technique(s) Discounted cash flows Discounted cash flows
Significant Unobservable Inputs Discount rate Discount rate
Weighted Average Discount Rate 7.10% 6.60%
Certain investment in affiliates | Discounted Cash Flows Valuation Technique
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value   ¥ 3,704
Valuation Technique(s)   Discounted cash flows
Significant Unobservable Inputs   Discount rate
Weighted Average Discount Rate   8.80%
Minimum | Real Estate Collateral Dependent Loans | Discounted Cash Flows Valuation Technique
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Weighted Average Discount Rate 5.30% 5.40%
Minimum | Real Estate Collateral Dependent Loans | Direct Capitalization Valuation Technique
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Weighted Average Discount Rate 5.60% 5.00%
Minimum | Investment in Operating Leases and Other Operating Assets | Discounted Cash Flows Valuation Technique
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Weighted Average Discount Rate 5.20% 4.40%
Minimum | Land And Buildings Undeveloped Or Under Construction | Discounted Cash Flows Valuation Technique
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Weighted Average Discount Rate 3.90% 4.70%
Minimum | Certain investment in affiliates | Discounted Cash Flows Valuation Technique
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Weighted Average Discount Rate   5.00%
Maximum | Real Estate Collateral Dependent Loans | Discounted Cash Flows Valuation Technique
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Weighted Average Discount Rate 19.00% 19.00%
Maximum | Real Estate Collateral Dependent Loans | Direct Capitalization Valuation Technique
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Weighted Average Discount Rate 19.00% 21.00%
Maximum | Investment in Operating Leases and Other Operating Assets | Discounted Cash Flows Valuation Technique
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Weighted Average Discount Rate 11.00% 12.70%
Maximum | Land And Buildings Undeveloped Or Under Construction | Discounted Cash Flows Valuation Technique
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Weighted Average Discount Rate 9.90% 9.60%
Maximum | Certain investment in affiliates | Discounted Cash Flows Valuation Technique
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Weighted Average Discount Rate   9.20%