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Fair Value Of Financial Instruments And Concentration Of Credit Risk (Schedule Of Carrying Value And Fair Value Of Financial Instruments) (Detail) In Millions, unless otherwise specified	Mar. 31, 2013 USD ($)	Mar. 31, 2013 JPY (¥)	Mar. 31, 2012 USD ($)	Mar. 31, 2012 JPY (¥)	Mar. 31, 2013 Level 2 USD ($)	Mar. 31, 2012 Level 2 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Finance receivables-net, Carrying Value		¥ 261,950		¥ 203,861
Long-term trade accounts receivable, Carrying Value		59,669		57,283
Long-term debt, Carrying Value		(337,435)		(288,272)
Financing receivable, fair value	262,613		205,638		262,613	205,638
Long term accounts receivable, fair value	63,538		60,583		63,538	60,583
Long term debt, fair value	$ (338,474)		$ (288,038)		$ (338,474)	$ (288,038)

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). 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.

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