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Composition of Short Term Debt and Weighted Average Contract Interest Rate on Short Term Debt (Detail) In Millions, unless otherwise specified | Mar. 31, 2011 USD ($) | Mar. 31, 2011 JPY (¥) | Mar. 31, 2010 JPY (¥) | Mar. 31, 2011 Japan Bank Borrowings USD ($) | Mar. 31, 2011 Japan Bank Borrowings JPY (¥) | Mar. 31, 2010 Japan Bank Borrowings JPY (¥) | Mar. 31, 2011 Japan Commercial Paper USD ($) | Mar. 31, 2011 Japan Commercial Paper JPY (¥) | Mar. 31, 2010 Japan Commercial Paper JPY (¥) | Mar. 31, 2010 Japan Medium-term Notes JPY (¥) | Mar. 31, 2011 Overseas Bank Borrowings USD ($) | Mar. 31, 2011 Overseas Bank Borrowings JPY (¥) | Mar. 31, 2010 Overseas Bank Borrowings JPY (¥)
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Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Short-Term Debt | $ 5,756 | ¥ 478,633 | ¥ 573,565 | $ 2,342 | ¥ 194,728 | ¥ 158,469 | $ 2,174 | ¥ 180,798 | ¥ 282,781 | ¥ 19,550 | $ 1,240 | ¥ 103,107 | ¥ 112,765
Weighted average rate | 1.30% | 1.30% | 1.20% | 1.30% | 1.30% | 1.60% | 0.20% | 0.20% | 0.30% | 1.70% | 3.10% | 3.10% | 2.60%

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- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 2, 3 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Subparagraph a(1) -Article 7 + Details
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- Definition Reflects the calculation as of the balance-sheet date of the average interest rate weighted by the amount of short-term debt outstanding by type or by instrument at that time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph b -Article 5 + Details
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