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Financial Instruments and Derivatives Financial Instruments, Except for Investment in Direct Financing Leases, Investment in Subsidiaries and Affiliates, Pension Obligations and Insurance Contracts (Detail) In Millions | Mar. 31, 2011 USD ($) | Mar. 31, 2011 JPY (¥) | Mar. 31, 2010 USD ($) | Mar. 31, 2010 JPY (¥) | Mar. 31, 2009 JPY (¥) | Mar. 31, 2008 JPY (¥) | Mar. 31, 2011 Carrying amount Trading Instruments USD ($) | Mar. 31, 2011 Carrying amount Trading Instruments JPY (¥) | Mar. 31, 2010 Carrying amount Trading Instruments JPY (¥) | Mar. 31, 2011 Carrying amount Trading Instruments Futures, Foreign exchange contracts USD ($) | Mar. 31, 2011 Carrying amount Trading Instruments Futures, Foreign exchange contracts JPY (¥) | Mar. 31, 2010 Carrying amount Trading Instruments Futures, Foreign exchange contracts JPY (¥) | Mar. 31, 2011 Carrying amount Trading Instruments Credit derivatives held/written USD ($) | Mar. 31, 2011 Carrying amount Trading Instruments Credit derivatives held/written JPY (¥) | Mar. 31, 2010 Carrying amount Trading Instruments Credit derivatives held/written JPY (¥) | Mar. 31, 2010 Carrying amount Trading Instruments Options held/written, Caps held JPY (¥) | Mar. 31, 2011 Carrying amount Trading Instruments Options Held (Written), Caps Held and Other USD ($) | Mar. 31, 2011 Carrying amount Trading Instruments Options Held (Written), Caps Held and Other JPY (¥) | Mar. 31, 2011 Carrying amount Non Trading Instruments Futures, Foreign exchange contracts USD ($) | Mar. 31, 2011 Carrying amount Non Trading Instruments Futures, Foreign exchange contracts JPY (¥) | Mar. 31, 2010 Carrying amount Non Trading Instruments Futures, Foreign exchange contracts JPY (¥) | Mar. 31, 2011 Carrying amount Non Trading Instruments Assets USD ($) | Mar. 31, 2011 Carrying amount Non Trading Instruments Assets JPY (¥) | Mar. 31, 2010 Carrying amount Non Trading Instruments Assets JPY (¥) | Mar. 31, 2011 Carrying amount Non Trading Instruments Investment in securities USD ($) | Mar. 31, 2011 Carrying amount Non Trading Instruments Investment in securities JPY (¥) | Mar. 31, 2010 Carrying amount Non Trading Instruments Investment in securities JPY (¥) | Mar. 31, 2011 Carrying amount Non Trading Instruments Liabilities USD ($) | Mar. 31, 2011 Carrying amount Non Trading Instruments Liabilities JPY (¥) | Mar. 31, 2010 Carrying amount Non Trading Instruments Liabilities JPY (¥) | Mar. 31, 2011 Carrying amount Non Trading Instruments Foreign currency swap agreements USD ($) | Mar. 31, 2011 Carrying amount Non Trading Instruments Foreign currency swap agreements JPY (¥) | Mar. 31, 2010 Carrying amount Non Trading Instruments Foreign currency swap agreements JPY (¥) | Mar. 31, 2011 Carrying amount Non Trading Instruments Interest rate swap agreements USD ($) | Mar. 31, 2011 Carrying amount Non Trading Instruments Interest rate swap agreements JPY (¥) | Mar. 31, 2010 Carrying amount Non Trading Instruments Interest rate swap agreements JPY (¥) | Mar. 31, 2011 Estimated fair value Trading Instruments USD ($) | Mar. 31, 2011 Estimated fair value Trading Instruments JPY (¥) | Mar. 31, 2010 Estimated fair value Trading Instruments JPY (¥) | Mar. 31, 2011 Estimated fair value Trading Instruments Futures, Foreign exchange contracts USD ($) | Mar. 31, 2011 Estimated fair value Trading Instruments Futures, Foreign exchange contracts JPY (¥) | Mar. 31, 2010 Estimated fair value Trading Instruments Futures, Foreign exchange contracts JPY (¥) | Mar. 31, 2011 Estimated fair value Trading Instruments Credit derivatives held/written USD ($) | Mar. 31, 2011 Estimated fair value Trading Instruments Credit derivatives held/written JPY (¥) | Mar. 31, 2010 Estimated fair value Trading Instruments Credit derivatives held/written JPY (¥) | Mar. 31, 2010 Estimated fair value Trading Instruments Options held/written, Caps held JPY (¥) | Mar. 31, 2011 Estimated fair value Trading Instruments Options Held (Written), Caps Held and Other USD ($) | Mar. 31, 2011 Estimated fair value Trading Instruments Options Held (Written), Caps Held and Other JPY (¥) | Mar. 31, 2011 Estimated fair value Non Trading Instruments Futures, Foreign exchange contracts USD ($) | Mar. 31, 2011 Estimated fair value Non Trading Instruments Futures, Foreign exchange contracts JPY (¥) | Mar. 31, 2010 Estimated fair value Non Trading Instruments Futures, Foreign exchange contracts JPY (¥) | Mar. 31, 2011 Estimated fair value Non Trading Instruments Assets USD ($) | Mar. 31, 2011 Estimated fair value Non Trading Instruments Assets JPY (¥) | Mar. 31, 2010 Estimated fair value Non Trading Instruments Assets JPY (¥) | Mar. 31, 2011 Estimated fair value Non Trading Instruments Investment in securities USD ($) | Mar. 31, 2011 Estimated fair value Non Trading Instruments Investment in securities JPY (¥) | Mar. 31, 2010 Estimated fair value Non Trading Instruments Investment in securities JPY (¥) | Mar. 31, 2011 Estimated fair value Non Trading Instruments Liabilities USD ($) | Mar. 31, 2011 Estimated fair value Non Trading Instruments Liabilities JPY (¥) | Mar. 31, 2010 Estimated fair value Non Trading Instruments Liabilities JPY (¥) | Mar. 31, 2011 Estimated fair value Non Trading Instruments Foreign currency swap agreements USD ($) | Mar. 31, 2011 Estimated fair value Non Trading Instruments Foreign currency swap agreements JPY (¥) | Mar. 31, 2010 Estimated fair value Non Trading Instruments Foreign currency swap agreements JPY (¥) | Mar. 31, 2011 Estimated fair value Non Trading Instruments Interest rate swap agreements USD ($) | Mar. 31, 2011 Estimated fair value Non Trading Instruments Interest rate swap agreements JPY (¥) | Mar. 31, 2010 Estimated fair value Non Trading Instruments Interest rate swap agreements JPY (¥)
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trading securities | $ 866 | ¥ 71,991 |  | ¥ 49,596 |  |  | $ 866 | ¥ 71,991 | ¥ 49,596 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 866 | ¥ 71,991 | ¥ 49,596 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | 103,206 | 8,581,582 |  | 7,739,800 |  |  |  |  |  | 18 | 1,524 | 1,198 | 1 | 49 | 528 | 555 | 42 | 3,467 | 13 | 1,109 | 877 |  |  |  |  |  |  |  |  |  | 178 | 14,766 | 13,724 | 25 | 2,070 | 192 |  |  |  | 18 | 1,524 | 1,198 | 1 | 49 | 528 | 555 | 42 | 3,467 | 13 | 1,109 | 877 |  |  |  |  |  |  |  |  |  | 178 | 14,766 | 13,724 | 25 | 2,070 | 192
Liabilities | 86,670 | 7,206,652 |  | 6,395,244 |  |  |  |  |  | 15 | 1,254 | 766 | 3 | 236 | 40 | 189 | 25 | 2,071 | 45 | 3,714 | 4,971 |  |  |  |  |  |  |  |  |  | 403 | 33,481 | 23,053 | 16 | 1,320 | 2,956 |  |  |  | 15 | 1,254 | 766 | 3 | 236 | 40 | 189 | 25 | 2,071 | 45 | 3,714 | 4,971 |  |  |  |  |  |  |  |  |  | 403 | 33,481 | 23,053 | 16 | 1,320 | 2,956
Cash and Cash Equivalents | 8,805 | 732,127 | 7,686 | 639,087 | 459,969 | 320,655 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,805 | 732,127 | 639,087 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,805 | 732,127 | 639,087 |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash | 1,420 | 118,065 |  | 77,486 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,420 | 118,065 | 77,486 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,420 | 118,065 | 77,486 |  |  |  |  |  |  |  |  |  |  |  |
Time Deposits | 62 | 5,148 |  | 548 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 62 | 5,148 | 548 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 62 | 5,148 | 548 |  |  |  |  |  |  |  |  |  |  |  |
Installment loans (net of allowance for probable loan losses) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,278 | 2,850,215 | 2,330,697 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,406 | 2,860,886 | 2,318,466 |  |  |  |  |  |  |  |  |  |  |  |
Practicable to estimate fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,270 | 937,129 | 903,658 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,275 | 937,541 | 902,943 |  |  |  |  |  |  |  |  |
Not practicable to estimate fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000 | 166,261 | 150,904 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000 | 166,261 | 150,904 |  |  |  |  |  |  |  |  |
Short-Term Debt | 5,756 | 478,633 |  | 573,565 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,756 | 478,633 | 573,565 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,756 | 478,633 | 573,565 |  |  |  |  |  |
Deposits | 12,810 | 1,065,175 |  | 853,269 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,810 | 1,065,175 | 853,269 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,874 | 1,070,513 | 855,620 |  |  |  |  |  |
Long-Term Debt | $ 54,495 | ¥ 4,531,268 |  | ¥ 3,836,270 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 54,495 | ¥ 4,531,268 | ¥ 3,836,270 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 54,014 | ¥ 4,491,271 | ¥ 3,869,238 |  |  |  |  |  |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Concepts (CON) -Number 6 -Paragraph 25 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 + Details
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- Definition This item represents a financial instrument (as defined) for which it is not practicable to estimate fair value. Such disclosure may be for an individual financial instrument or a class of financial instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph a Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 14 -Subparagraph a + Details
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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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- Definition Any certificate of deposit or savings account held by a bank or other financial institution for a short-term specified period of time. Because of their short-term, time deposits are considered highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 + Details
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- Definition The total of financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for debt and equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition; this is the reason why the trading category of investments in debt and equity securities are bought and sold "principally" for sale in the near term. Transfers into and out of the trading category should be rare. Such financial instruments that are held as of the reporting date are measured at fair value with unrealized holding gains and losses (the difference between fair value and the previously reported carrying amount) included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 29 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Implementation Guide (Q and A) -Number FAS115 -Paragraph 35 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph a + Details
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