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Estimated Fair Values of Canon's Financial Instruments (Detail) (JPY ¥) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Carrying Amounts and Fair Values of Financial Instruments [Line Items]
Long-term debt, including current installments	¥ (7,070)	¥ (9,260)
Carrying (Reported) Amount, Fair Value Disclosure
Carrying Amounts and Fair Values of Financial Instruments [Line Items]
Long-term debt, including current installments	(7,070)	(9,260)
Foreign exchange contract assets	4,718	11,950
Foreign exchange contract liabilities	(2,610)	(913)
Estimate of Fair Value, Fair Value Disclosure
Carrying Amounts and Fair Values of Financial Instruments [Line Items]
Long-term debt, including current installments	(7,053)	(9,245)
Foreign exchange contract assets	4,718	11,950
Foreign exchange contract liabilities	¥ (2,610)	¥ (913)

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.

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