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Information about Credit Quality Indicators (Detail) In Millions	Mar. 31, 2011 USD ($)	Mar. 31, 2011 JPY (¥)	Mar. 31, 2011 Purchased loans Performing USD ($)	Mar. 31, 2011 Purchased loans Performing JPY (¥)	Mar. 31, 2011 Japan Direct financing leases Performing USD ($)	Mar. 31, 2011 Japan Direct financing leases Performing JPY (¥)	Mar. 31, 2011 Japan Corporate Non-recourse loans Performing USD ($)	Mar. 31, 2011 Japan Corporate Non-recourse loans Performing JPY (¥)	Mar. 31, 2011 Overseas Direct financing leases Performing USD ($)	Mar. 31, 2011 Overseas Direct financing leases Performing JPY (¥)	Mar. 31, 2011 Consumer Housing loans Performing JPY (¥)	Mar. 31, 2011 Consumer Housing loans Performing USD ($)	Mar. 31, 2011 Consumer Other Performing USD ($)	Mar. 31, 2011 Consumer Other Performing JPY (¥)	Mar. 31, 2011 Corporate Non-recourse loans U.S. Performing USD ($)	Mar. 31, 2011 Corporate Non-recourse loans U.S. Performing JPY (¥)	Mar. 31, 2011 Other Real estate companies Performing USD ($)	Mar. 31, 2011 Other Real estate companies Performing JPY (¥)	Mar. 31, 2011 Other Entertainment companies Performing USD ($)	Mar. 31, 2011 Other Entertainment companies Performing JPY (¥)	Mar. 31, 2011 All other Performing JPY (¥)	Mar. 31, 2011 All other Performing USD ($)	Mar. 31, 2011 Corporate loans Performing JPY (¥)	Mar. 31, 2011 Corporate loans Performing USD ($)	Mar. 31, 2011 Performing USD ($)	Mar. 31, 2011 Performing JPY (¥)	Mar. 31, 2011 Purchased loans Non-performing Loans individually evaluated for impairment USD ($)	Mar. 31, 2011 Purchased loans Non-performing Loans individually evaluated for impairment JPY (¥)	Mar. 31, 2011 Japan Direct financing leases Non-performing Loans individually evaluated for impairment USD ($)	Mar. 31, 2011 Japan Corporate Non-recourse loans Non-performing Loans individually evaluated for impairment USD ($)	Mar. 31, 2011 Japan Corporate Non-recourse loans Non-performing Loans individually evaluated for impairment JPY (¥)	Mar. 31, 2011 Overseas Direct financing leases Non-performing Loans individually evaluated for impairment USD ($)	Mar. 31, 2011 Consumer Housing loans Non-performing Loans individually evaluated for impairment USD ($)	Mar. 31, 2011 Consumer Housing loans Non-performing Loans individually evaluated for impairment JPY (¥)	Mar. 31, 2011 Consumer Other Non-performing Loans individually evaluated for impairment JPY (¥)	Mar. 31, 2011 Corporate Non-recourse loans U.S. Non-performing Loans individually evaluated for impairment JPY (¥)	Mar. 31, 2011 Corporate Non-recourse loans U.S. Non-performing Loans individually evaluated for impairment USD ($)	Mar. 31, 2011 Other Real estate companies Non-performing Loans individually evaluated for impairment JPY (¥)	Mar. 31, 2011 Other Real estate companies Non-performing Loans individually evaluated for impairment USD ($)	Mar. 31, 2011 Other Entertainment companies Non-performing Loans individually evaluated for impairment USD ($)	Mar. 31, 2011 Other Entertainment companies Non-performing Loans individually evaluated for impairment JPY (¥)	Mar. 31, 2011 All other Non-performing Loans individually evaluated for impairment JPY (¥)	Mar. 31, 2011 All other Non-performing Loans individually evaluated for impairment USD ($)	Mar. 31, 2011 Corporate loans Non-performing Loans individually evaluated for impairment USD ($)	Mar. 31, 2011 Corporate loans Non-performing Loans individually evaluated for impairment JPY (¥)	Mar. 31, 2011 Non-performing Loans individually evaluated for impairment USD ($)	Mar. 31, 2011 Non-performing Loans individually evaluated for impairment JPY (¥)	Mar. 31, 2011 Purchased loans Non-performing 90+ days past-due Loans not individually evaluated for impairment USD ($)	Mar. 31, 2011 Japan Direct financing leases Non-performing 90+ days past-due Loans not individually evaluated for impairment USD ($)	Mar. 31, 2011 Japan Direct financing leases Non-performing 90+ days past-due Loans not individually evaluated for impairment JPY (¥)	Mar. 31, 2011 Japan Corporate Non-recourse loans Non-performing 90+ days past-due Loans not individually evaluated for impairment USD ($)	Mar. 31, 2011 Overseas Direct financing leases Non-performing 90+ days past-due Loans not individually evaluated for impairment USD ($)	Mar. 31, 2011 Overseas Direct financing leases Non-performing 90+ days past-due Loans not individually evaluated for impairment JPY (¥)	Mar. 31, 2011 Consumer Housing loans Non-performing 90+ days past-due Loans not individually evaluated for impairment JPY (¥)	Mar. 31, 2011 Consumer Housing loans Non-performing 90+ days past-due Loans not individually evaluated for impairment USD ($)	Mar. 31, 2011 Consumer Other Non-performing 90+ days past-due Loans not individually evaluated for impairment JPY (¥)	Mar. 31, 2011 Consumer Other Non-performing 90+ days past-due Loans not individually evaluated for impairment USD ($)	Mar. 31, 2011 Corporate Non-recourse loans U.S. Non-performing 90+ days past-due Loans not individually evaluated for impairment USD ($)	Mar. 31, 2011 Other Real estate companies Non-performing 90+ days past-due Loans not individually evaluated for impairment JPY (¥)	Mar. 31, 2011 Other Entertainment companies Non-performing 90+ days past-due Loans not individually evaluated for impairment JPY (¥)	Mar. 31, 2011 All other Non-performing 90+ days past-due Loans not individually evaluated for impairment JPY (¥)	Mar. 31, 2011 Corporate loans Non-performing 90+ days past-due Loans not individually evaluated for impairment JPY (¥)	Mar. 31, 2011 Non-performing 90+ days past-due Loans not individually evaluated for impairment USD ($)	Mar. 31, 2011 Non-performing 90+ days past-due Loans not individually evaluated for impairment JPY (¥)	Mar. 31, 2011 Purchased loans Nonperforming USD ($)	Mar. 31, 2011 Purchased loans Nonperforming JPY (¥)	Mar. 31, 2011 Japan Direct financing leases Nonperforming USD ($)	Mar. 31, 2011 Japan Direct financing leases Nonperforming JPY (¥)	Mar. 31, 2011 Japan Corporate Non-recourse loans Nonperforming USD ($)	Mar. 31, 2011 Japan Corporate Non-recourse loans Nonperforming JPY (¥)	Mar. 31, 2011 Overseas Direct financing leases Nonperforming USD ($)	Mar. 31, 2011 Overseas Direct financing leases Nonperforming JPY (¥)	Mar. 31, 2011 Consumer Housing loans Nonperforming JPY (¥)	Mar. 31, 2011 Consumer Housing loans Nonperforming USD ($)	Mar. 31, 2011 Consumer Other Nonperforming USD ($)	Mar. 31, 2011 Consumer Other Nonperforming JPY (¥)	Mar. 31, 2011 Corporate Non-recourse loans U.S. Nonperforming JPY (¥)	Mar. 31, 2011 Corporate Non-recourse loans U.S. Nonperforming USD ($)	Mar. 31, 2011 Other Real estate companies Nonperforming JPY (¥)	Mar. 31, 2011 Other Real estate companies Nonperforming USD ($)	Mar. 31, 2011 Other Entertainment companies Nonperforming JPY (¥)	Mar. 31, 2011 Other Entertainment companies Nonperforming USD ($)	Mar. 31, 2011 All other Nonperforming JPY (¥)	Mar. 31, 2011 All other Nonperforming USD ($)	Mar. 31, 2011 Corporate loans Nonperforming JPY (¥)	Mar. 31, 2011 Corporate loans Nonperforming USD ($)	Mar. 31, 2011 Nonperforming USD ($)	Mar. 31, 2011 Nonperforming JPY (¥)	Mar. 31, 2011 Consumer Housing loans USD ($)	Mar. 31, 2011 Consumer Housing loans JPY (¥)	Mar. 31, 2011 Consumer Other USD ($)	Mar. 31, 2011 Consumer Other JPY (¥)	Mar. 31, 2011 Corporate loans JPY (¥)	Mar. 31, 2011 Corporate loans USD ($)	Mar. 31, 2011 Japan Corporate Non-recourse loans USD ($)	Mar. 31, 2011 Japan Corporate Non-recourse loans JPY (¥)	Mar. 31, 2011 Corporate Non-recourse loans U.S. USD ($)	Mar. 31, 2011 Corporate Non-recourse loans U.S. JPY (¥)	Mar. 31, 2011 Other Real estate companies JPY (¥)	Mar. 31, 2011 Other Real estate companies USD ($)	Mar. 31, 2011 Other Entertainment companies USD ($)	Mar. 31, 2011 Other Entertainment companies JPY (¥)	Mar. 31, 2011 All other USD ($)	Mar. 31, 2011 All other JPY (¥)	Mar. 31, 2011 Purchased loans USD ($)	Mar. 31, 2011 Purchased loans JPY (¥)	Mar. 31, 2011 Japan Direct financing leases USD ($)	Mar. 31, 2011 Japan Direct financing leases JPY (¥)	Mar. 31, 2011 Overseas Direct financing leases USD ($)	Mar. 31, 2011 Overseas Direct financing leases JPY (¥)
Financing Receivable, Recorded Investment [Line Items]
Financing receivable	$ 45,704	¥ 3,800,299	$ 898	¥ 74,650	$ 7,516	¥ 624,919	$ 3,394	¥ 282,222	$ 2,202	¥ 183,147	¥ 807,194	$ 9,708	$ 179	¥ 14,876	$ 7,183	¥ 597,322	$ 3,519	¥ 292,607	$ 1,394	¥ 115,876	¥ 462,631	$ 5,563	¥ 1,750,658	$ 21,053	$ 41,556	¥ 3,455,444	$ 441	¥ 36,685	$ 0	$ 258	¥ 21,418	$ 0	$ 100	¥ 8,312	¥ 0	¥ 51,611	$ 621	¥ 93,607	$ 1,126	$ 356	¥ 29,597	¥ 70,801	$ 851	$ 3,212	¥ 267,034	$ 3,753	¥ 312,031	$ 0	$ 215	¥ 17,908	$ 0	$ 59	¥ 4,879	¥ 9,972	$ 120	¥ 65	$ 1	$ 0	¥ 0	¥ 0	¥ 0	¥ 0	$ 395	¥ 32,824	$ 441	¥ 36,685	$ 215	¥ 17,908	$ 258	¥ 21,418	$ 59	¥ 4,879	¥ 18,284	$ 220	$ 1	¥ 65	¥ 51,611	$ 621	¥ 93,607	$ 1,126	¥ 29,597	$ 356	¥ 70,801	$ 851	¥ 267,034	$ 3,212	$ 4,148	¥ 344,855	$ 9,928	¥ 825,478	$ 180	¥ 14,941	¥ 2,017,692	$ 24,265	$ 3,652	¥ 303,640	$ 7,804	¥ 648,933	¥ 386,214	$ 4,645	$ 1,750	¥ 145,473	$ 6,414	¥ 533,432	$ 1,339	¥ 111,335	$ 7,731	¥ 642,827	$ 2,261	¥ 188,026

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A contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, accounts receivable (with terms exceeding one year), notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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