2.2.0.25falsefalse0610 - Disclosure - Trade Payables (Details)truefalseIn Millionsfalse1falsefalseJPYfalsefalse12/31/2010 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_NotesAndAccountsPayableCurrentAbstractcajfalsenadurationNotes and accounts payable, current.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNotes and accounts payable, current.falsefalseTrade payables4false0us-gaap_NotesPayableus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse1367600000013676falsetruefalsefalsefalse2truefalsefalse76080000007608falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryIncluding the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance-sheet date, with initial maturities beyond one year or beyond the normal 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 falsefalseNotes5false0us-gaap_AccountsPayableTradeCurrentus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse369575000000369575falsefalsefalsefalsefalse2truefalsefalse331505000000331505falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryCarrying value as of the balance sheet date of obligations incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal 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 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 3 -Section A -Paragraph 7 truefalseAccounts6false0caj_NotesAndAccountsPayableCurrentcajfalsecreditinstantNotes and Accounts Payable, current.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse383251000000383251falsetruefalsefalsefalse2truefalsefalse339113000000339113falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNotes and Accounts Payable, current.No authoritative reference available.truefalseTrade payables,Total24Trade Payables (Details) (JPY ¥)MillionsUnKnownUnKnownUnKnownfalsetrue