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Contractual Maturities of Installment Loans Except Purchased Loans (Detail)
In Millions
Mar. 31, 2011
USD ($)
Mar. 31, 2011
JPY (¥)
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2012 $ 9,664 ¥ 803,554
2013 6,280 522,216
2014 5,114 425,198
2015 2,770 230,286
2016 2,142 178,146
Thereafter 8,568 712,429
Total $ 34,538 ¥ 2,871,829