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Financial Instruments and Derivatives Financial Instruments, Other Than Investment in Direct Financing Leases, Investment in Subsidiaries and Affiliates, Pension Obligations and Insurance Contracts (Detail) (JPY ¥)
In Millions, unless otherwise specified
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities ¥ 16,079 ¥ 33,041    
Assets 9,069,392 8,439,710 8,332,830  
Liabilities 6,921,037 6,710,516    
Cash and cash equivalents 827,299 826,296 786,892 732,127
Restricted cash 86,690 106,919    
Time Deposits 7,510 8,356    
Short-term debt 309,591 420,726    
Deposits 1,206,413 1,078,587    
Long-Term Debt 3,858,874 4,061,534    
Trading Instruments | Level 1
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 275 2,184    
Trading Instruments | Level 1 | Futures, Foreign exchange contracts
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 8 147    
Liabilities 28 0    
Trading Instruments | Level 1 | Credit derivatives held/written
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 0 0    
Liabilities 0 0    
Trading Instruments | Level 1 | Options Held (Written) and Other
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 0 0    
Liabilities 0 0    
Trading Instruments | Level 2
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 15,804 30,857    
Trading Instruments | Level 2 | Futures, Foreign exchange contracts
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 0 0    
Liabilities 156 0    
Trading Instruments | Level 2 | Credit derivatives held/written
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 29 370    
Liabilities 265 100    
Trading Instruments | Level 2 | Options Held (Written) and Other
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 3,000 3,555    
Liabilities 3,605 3,530    
Trading Instruments | Level 3
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 0 0    
Trading Instruments | Level 3 | Futures, Foreign exchange contracts
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 0 0    
Liabilities 0 0    
Trading Instruments | Level 3 | Credit derivatives held/written
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 0 0    
Liabilities 0 0    
Trading Instruments | Level 3 | Options Held (Written) and Other
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 2,486 2,099    
Liabilities 0 0    
Non Trading Instruments | Level 1 | Futures, Foreign exchange contracts
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 0 0    
Liabilities 0 0    
Non Trading Instruments | Level 1 | Assets
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 827,299 826,296    
Restricted cash 86,690 106,919    
Time Deposits 0 0    
Installment loans (net of allowance for probable loan losses) 0 0    
Non Trading Instruments | Level 1 | Investment in securities
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Practicable to estimate fair value 230,618 166,398    
Not practicable to estimate fair value 0 [1] 0 [2]    
Non Trading Instruments | Level 1 | Liabilities
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Short-term debt 0 0    
Deposits 0 0    
Long-Term Debt 0 0    
Non Trading Instruments | Level 1 | Foreign currency swap agreements
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 0 0    
Liabilities 0 0    
Non Trading Instruments | Level 1 | Interest rate swap agreements
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 0 0    
Liabilities 0 0    
Non Trading Instruments | Level 2 | Futures, Foreign exchange contracts
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 852 883    
Liabilities 4,782 4,685    
Non Trading Instruments | Level 2 | Assets
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 0 0    
Restricted cash 0 0    
Time Deposits 7,510 8,356    
Installment loans (net of allowance for probable loan losses) 120,583 82,125    
Non Trading Instruments | Level 2 | Investment in securities
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Practicable to estimate fair value 671,023 552,394    
Not practicable to estimate fair value 0 [1] 0 [2]    
Non Trading Instruments | Level 2 | Liabilities
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Short-term debt 309,591 420,726    
Deposits 1,206,642 1,081,273    
Long-Term Debt 1,235,377 1,486,219    
Non Trading Instruments | Level 2 | Foreign currency swap agreements
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 3,534 2,890    
Liabilities 7,176 8,263    
Non Trading Instruments | Level 2 | Interest rate swap agreements
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 2,528 4,654    
Liabilities 634 1,459    
Non Trading Instruments | Level 3 | Futures, Foreign exchange contracts
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 0 0    
Liabilities 0 0    
Non Trading Instruments | Level 3 | Assets
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 0 0    
Restricted cash 0 0    
Time Deposits 0 0    
Installment loans (net of allowance for probable loan losses) 2,154,339 2,543,007    
Non Trading Instruments | Level 3 | Investment in securities
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Practicable to estimate fair value 90,318 142,778    
Not practicable to estimate fair value 0 [1] 0 [2]    
Non Trading Instruments | Level 3 | Liabilities
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Short-term debt 0 0    
Deposits 0 0    
Long-Term Debt 2,630,079 2,595,693    
Non Trading Instruments | Level 3 | Foreign currency swap agreements
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 0 0    
Liabilities 0 0    
Non Trading Instruments | Level 3 | Interest rate swap agreements
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 0 0    
Liabilities 0 0    
Carrying amount | Trading Instruments
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 16,079 33,041    
Carrying amount | Trading Instruments | Futures, Foreign exchange contracts
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 8 147    
Liabilities 184 0    
Carrying amount | Trading Instruments | Credit derivatives held/written
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 29 370    
Liabilities 265 100    
Carrying amount | Trading Instruments | Options Held (Written) and Other
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 5,486 5,654    
Liabilities 3,605 3,530    
Carrying amount | Non Trading Instruments | Futures, Foreign exchange contracts
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 852 883    
Liabilities 4,782 4,685    
Carrying amount | Non Trading Instruments | Assets
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 827,299 826,296    
Restricted cash 86,690 106,919    
Time Deposits 7,510 8,356    
Installment loans (net of allowance for probable loan losses) 2,246,143 2,602,737    
Carrying amount | Non Trading Instruments | Investment in securities
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Practicable to estimate fair value 984,654 852,550    
Not practicable to estimate fair value 213,843 [1] 208,077 [2]    
Carrying amount | Non Trading Instruments | Liabilities
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Short-term debt 309,591 420,726    
Deposits 1,206,413 1,078,587    
Long-Term Debt 3,858,874 4,061,534    
Carrying amount | Non Trading Instruments | Foreign currency swap agreements
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 3,534 2,890    
Liabilities 7,176 8,263    
Carrying amount | Non Trading Instruments | Interest rate swap agreements
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 2,528 4,654    
Liabilities 634 1,459    
Estimated fair value | Trading Instruments
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 16,079 33,041    
Estimated fair value | Trading Instruments | Futures, Foreign exchange contracts
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 8 147    
Liabilities 184 0    
Estimated fair value | Trading Instruments | Credit derivatives held/written
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 29 370    
Liabilities 265 100    
Estimated fair value | Trading Instruments | Options Held (Written) and Other
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 5,486 5,654    
Liabilities 3,605 3,530    
Estimated fair value | Non Trading Instruments | Futures, Foreign exchange contracts
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 852 883    
Liabilities 4,782 4,685    
Estimated fair value | Non Trading Instruments | Assets
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 827,299 826,296    
Restricted cash 86,690 106,919    
Time Deposits 7,510 8,356    
Installment loans (net of allowance for probable loan losses) 2,274,922 2,625,132    
Estimated fair value | Non Trading Instruments | Investment in securities
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Practicable to estimate fair value 991,959 861,570    
Not practicable to estimate fair value 213,843 [1] 208,077 [2]    
Estimated fair value | Non Trading Instruments | Liabilities
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Short-term debt 309,591 420,726    
Deposits 1,206,642 1,081,273    
Long-Term Debt 3,865,456 4,081,912    
Estimated fair value | Non Trading Instruments | Foreign currency swap agreements
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 3,534 2,890    
Liabilities 7,176 8,263    
Estimated fair value | Non Trading Instruments | Interest rate swap agreements
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets 2,528 4,654    
Liabilities ¥ 634 ¥ 1,459    
[1] The fair value of investment securities of ¥213,843 million was not estimated, as it was not practical.
[2] The fair value of investment securities of ¥208,077 million was not estimated, as it was not practical.