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Information about Credit Quality Indicators (Detail) (JPY ¥)
In Millions, unless otherwise specified
Dec. 31, 2011
Mar. 31, 2011
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable ¥ 3,571,831 ¥ 3,800,299
Consumer Housing loans
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 845,572 825,478
Consumer Other
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 14,758 14,941
Corporate loans
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 1,771,076 2,017,692
Corporate Non-recourse loans | Japan
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 258,050 303,640
Corporate Non-recourse loans | U.S.
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 535,737 648,933
Other Real estate companies
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 334,852 386,214
Other Entertainment companies
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 137,484 145,473
All other
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 504,953 533,432
Purchased loans
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 100,795 111,335
Direct financing leases | Japan
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 635,731 642,827
Direct financing leases | Overseas
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 203,899 188,026
Performing
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 3,260,984 3,455,444
Performing | Consumer Housing loans
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 827,902 807,194
Performing | Consumer Other
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 14,728 14,876
Performing | Corporate loans
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 1,529,571 1,750,658
Performing | Corporate Non-recourse loans | Japan
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 226,504 282,222
Performing | Corporate Non-recourse loans | U.S.
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 500,677 597,322
Performing | Other Real estate companies
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 254,363 292,607
Performing | Other Entertainment companies
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 113,920 115,876
Performing | All other
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 434,107 462,631
Performing | Purchased loans
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 69,273 74,650
Performing | Direct financing leases | Japan
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 618,516 624,919
Performing | Direct financing leases | Overseas
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 200,994 183,147
Non-performing Loans individually evaluated for impairment
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 281,957 312,031
Non-performing Loans individually evaluated for impairment | Consumer Housing loans
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 8,930 8,312
Non-performing Loans individually evaluated for impairment | Corporate loans
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 241,505 267,034
Non-performing Loans individually evaluated for impairment | Corporate Non-recourse loans | Japan
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 31,546 21,418
Non-performing Loans individually evaluated for impairment | Corporate Non-recourse loans | U.S.
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 35,060 51,611
Non-performing Loans individually evaluated for impairment | Other Real estate companies
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 80,489 93,607
Non-performing Loans individually evaluated for impairment | Other Entertainment companies
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 23,564 29,597
Non-performing Loans individually evaluated for impairment | All other
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 70,846 70,801
Non-performing Loans individually evaluated for impairment | Purchased loans
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 31,522 36,685
Non-performing 90+ days past-due Loans not individually evaluated for impairment
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 28,890 32,824
Non-performing 90+ days past-due Loans not individually evaluated for impairment | Consumer Housing loans
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 8,740 9,972
Non-performing 90+ days past-due Loans not individually evaluated for impairment | Consumer Other
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 30 65
Non-performing 90+ days past-due Loans not individually evaluated for impairment | Direct financing leases | Japan
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 17,215 17,908
Non-performing 90+ days past-due Loans not individually evaluated for impairment | Direct financing leases | Overseas
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 2,905 4,879
Nonperforming
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 310,847 344,855
Nonperforming | Consumer Housing loans
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 17,670 18,284
Nonperforming | Consumer Other
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 30 65
Nonperforming | Corporate loans
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 241,505 267,034
Nonperforming | Corporate Non-recourse loans | Japan
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 31,546 21,418
Nonperforming | Corporate Non-recourse loans | U.S.
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 35,060 51,611
Nonperforming | Other Real estate companies
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 80,489 93,607
Nonperforming | Other Entertainment companies
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 23,564 29,597
Nonperforming | All other
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 70,846 70,801
Nonperforming | Purchased loans
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 31,522 36,685
Nonperforming | Direct financing leases | Japan
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable 17,215 17,908
Nonperforming | Direct financing leases | Overseas
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable ¥ 2,905 ¥ 4,879