2.2.0.25falsefalse0609 - Disclosure - Short-Term Loans and Long-Term Debt (Details)truefalseIn Millions, unless otherwise specifiedfalse1falsefalseJPYfalsefalse12/31/2010 JPY (¥) ¥BalanceAsOf_31Dec2010http://www.sec.gov/CIK0000016988instant2010-12-31T00:00:000001-01-01T00:00:00JPYStandardhttp://www.xbrl.org/2003/iso4217JPYiso42170SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0JPYJPY¥2falsefalseJPYfalsefalse12/31/2009 JPY (¥) ¥BalanceAsOf_31Dec2009http://www.sec.gov/CIK0000016988instant2009-12-31T00:00:000001-01-01T00:00:00JPYStandardhttp://www.xbrl.org/2003/iso4217JPYiso42170SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0JPYJPY¥3true0caj_ShortTermLoansAndLongTermDebtTextualsAbstractcajfalsenadurationShort Term Loans.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringShort Term Loans.falsefalseShort Term Loans and Long Term Debt (Textuals) [Abstract]4false0us-gaap_ShortTermBankLoansAndNotesPayableus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse20710000002071falsetruefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryCarrying amount at the balance sheet date of borrowings from a bank, not elsewhere enumerated in the taxonomy, with a maturity within one year (or within one operating cycle if longer) from the date of borrowing.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 16 -Article 7 falsefalseShort-term loans consisting of bank borrowings5false0us-gaap_ShortTermDebtWeightedAverageInterestRateus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truetruefalse0.01460.0146falsefalsefalsefalsefalse2falsetruefalse00falsefalsefalsefalsefalseOtherus-types:percentItemTypepureReflects 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.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 falsefalseWeighted average interest rate on short-term loans outstanding6false0caj_WeightedAverageInterestRateForLongTermLoansOutstandingcajfalsenainstantWeighted average interest rate for long-term loans outstanding.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truetruefalse0.01830.0183falsefalsefalsefalsefalse2truetruefalse0.0030.003falsefalsefalsefalsefalseOtherus-types:percentItemTypepureWeighted average interest rate for long-term loans outstanding.No authoritative reference available.falsefalseWeighted average interest rate for long-term loans outstanding7true0us-gaap_LongTermDebtAndCapitalLeaseObligationsAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseLong-term Debt and Capital Lease Obligations [Abstract]8false0us-gaap_LoansPayableus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse10130000001013falsefalsefalsefalsefalse2truefalsefalse2000000020falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryIncluding the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 falsefalseLoans, principally from banks, maturing in installments through 2020; 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