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Reconciliation of Segment Totals to Consolidated Financial Statement Amounts (Detail) In Millions | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |
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Mar. 31, 2011 USD ($) | Mar. 31, 2011 JPY (¥) | Mar. 31, 2010 JPY (¥) | Mar. 31, 2009 JPY (¥) | Mar. 31, 2011 Total USD ($) | Mar. 31, 2011 Total JPY (¥) | Mar. 31, 2010 Total JPY (¥) | Mar. 31, 2009 Total JPY (¥) | Mar. 31, 2011 Corporate Assets USD ($) | Mar. 31, 2011 Corporate Assets JPY (¥) | Mar. 31, 2010 Corporate Assets JPY (¥) | Mar. 31, 2009 Corporate Assets JPY (¥) | Mar. 31, 2011 Variable Interest Entities USD ($) | Mar. 31, 2011 Variable Interest Entities JPY (¥) | Mar. 31, 2010 Variable Interest Entities JPY (¥) | Mar. 31, 2009 Variable Interest Entities JPY (¥) | Mar. 31, 2011 Segment, Discontinued Operations USD ($) | Mar. 31, 2011 Segment, Discontinued Operations JPY (¥) | Mar. 31, 2010 Segment, Discontinued Operations JPY (¥) | Mar. 31, 2009 Segment, Discontinued Operations JPY (¥) | Mar. 31, 2011 Corporate interest expenses, general and administrative expenses USD ($) | Mar. 31, 2011 Corporate interest expenses, general and administrative expenses JPY (¥) | Mar. 31, 2010 Corporate interest expenses, general and administrative expenses JPY (¥) | Mar. 31, 2009 Corporate interest expenses, general and administrative expenses JPY (¥) | Mar. 31, 2011 Corporate write-downs of securities USD ($) | Mar. 31, 2011 Corporate write-downs of securities JPY (¥) | Mar. 31, 2010 Corporate write-downs of securities JPY (¥) | Mar. 31, 2009 Corporate write-downs of securities JPY (¥) | Mar. 31, 2011 Corporate net gains (losses) on investment securities USD ($) | Mar. 31, 2011 Corporate net gains (losses) on investment securities JPY (¥) | Mar. 31, 2010 Corporate net gains (losses) on investment securities JPY (¥) | Mar. 31, 2009 Corporate net gains (losses) on investment securities JPY (¥) | Mar. 31, 2011 Corporate other gains (losses) USD ($) | Mar. 31, 2011 Corporate other gains (losses) JPY (¥) | Mar. 31, 2010 Corporate other gains (losses) JPY (¥) | Mar. 31, 2009 Corporate other gains (losses) JPY (¥) | Mar. 31, 2011 Gains (losses) related to assets or liabilities of certain VIEs USD ($) | Mar. 31, 2011 Gains (losses) related to assets or liabilities of certain VIEs JPY (¥) | Mar. 31, 2010 Gains (losses) related to assets or liabilities of certain VIEs JPY (¥) | Mar. 31, 2009 Gains (losses) related to assets or liabilities of certain VIEs JPY (¥) | Mar. 31, 2011 Net income attributable to the noncontrolling interests and net income attributable to the redeemable noncontrolling interests USD ($) | Mar. 31, 2011 Net income attributable to the noncontrolling interests and net income attributable to the redeemable noncontrolling interests JPY (¥) | Mar. 31, 2010 Net income attributable to the noncontrolling interests and net income attributable to the redeemable noncontrolling interests JPY (¥) | Mar. 31, 2009 Net income attributable to the noncontrolling interests and net income attributable to the redeemable noncontrolling interests JPY (¥) | Mar. 31, 2011 Cash and Cash Equivalents, Restricted Cash and Time Deposits USD ($) | Mar. 31, 2011 Cash and Cash Equivalents, Restricted Cash and Time Deposits JPY (¥) | Mar. 31, 2010 Cash and Cash Equivalents, Restricted Cash and Time Deposits JPY (¥) | Mar. 31, 2009 Cash and Cash Equivalents, Restricted Cash and Time Deposits JPY (¥) | Mar. 31, 2011 Allowance for doubtful receivables on direct financing leases and probable loan losses USD ($) | Mar. 31, 2011 Allowance for doubtful receivables on direct financing leases and probable loan losses JPY (¥) | Mar. 31, 2010 Allowance for doubtful receivables on direct financing leases and probable loan losses JPY (¥) | Mar. 31, 2009 Allowance for doubtful receivables on direct financing leases and probable loan losses JPY (¥) | Mar. 31, 2011 Other Receivables USD ($) | Mar. 31, 2011 Other Receivables JPY (¥) | Mar. 31, 2010 Other Receivables JPY (¥) | Mar. 31, 2009 Other Receivables JPY (¥) | Mar. 31, 2011 Other corporate assets USD ($) | Mar. 31, 2011 Other corporate assets JPY (¥) | Mar. 31, 2010 Other corporate assets JPY (¥) | Mar. 31, 2009 Other corporate assets JPY (¥)
Segment revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 11,667 | ¥ 970,110 | ¥ 912,294 | ¥ 1,032,486 | $ 11,280 | ¥ 937,963 | ¥ 954,062 | ¥ 1,084,454 | $ 42 | ¥ 3,440 | ¥ 5,818 | ¥ 7,963 | $ 622 | ¥ 51,747 | ¥ 3,455 | ¥ 4,825 | $ (277) | ¥ (23,040) | ¥ (51,041) | ¥ (64,756) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment profits: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income before Income Taxes and Discontinued Operations | 1,106 | 91,965 | 54,593 | 12,035 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment profits (losses) |  |  |  |  | 1,430 | 118,920 | 69,860 | 31,920 |  |  |  |  |  |  |  |  | (163) | (13,556) | (14,453) | (17,883) | (143) | (11,852) | (276) | (3,019) | (7) | (615) | (887) | 0 | 2 | 203 | 173 | 649 | (58) | (4,876) | (3,004) | (1,505) | (19) | (1,591) | 0 | 0 | 64 | 5,332 | 3,180 | 1,873 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | $ 103,206 | ¥ 8,581,582 | ¥ 7,739,800 | ¥ 8,369,736 | $ 73,876 | ¥ 6,142,818 | ¥ 6,284,275 | ¥ 6,879,043 |  |  |  |  | $ 12,169 | ¥ 1,011,833 | ¥ 199,660 | ¥ 353,628 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,287 | ¥ 855,340 | ¥ 717,121 | ¥ 588,705 | $ (1,854) | ¥ (154,150) | ¥ (157,523) | ¥ (158,544) | $ 2,189 | ¥ 182,013 | ¥ 210,521 | ¥ 228,581 | $ 6,539 | ¥ 543,728 | ¥ 485,746 | ¥ 478,323

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