2.2.0.25falsefalse0605 - Disclosure - Property, Plant and Equipment (Details)truefalseIn Millionsfalse1falsefalseJPYfalsefalse1/1/2010 - 12/31/2010 JPY (¥) JPY (¥) / shares ¥Jan-01-2010_Dec-31-2010http://www.sec.gov/CIK0000016988duration2010-01-01T00:00:002010-12-31T00:00:00JPYStandardhttp://www.xbrl.org/2003/iso4217JPYiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0JPYEPSDividehttp://www.xbrl.org/2003/iso4217JPYiso4217http://www.xbrl.org/2003/instancesharesxbrli0JPYJPY¥2falsefalseJPYfalsefalse1/1/2009 - 12/31/2009 JPY (¥) JPY (¥) / shares ¥TwelveMonthsEnded_31Dec2009http://www.sec.gov/CIK0000016988duration2009-01-01T00:00:002009-12-31T00:00:00JPYStandardhttp://www.xbrl.org/2003/iso4217JPYiso42170JPYEPSDividehttp://www.xbrl.org/2003/iso4217JPYiso4217http://www.xbrl.org/2003/instancesharesxbrli0PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0JPYJPY¥3falsefalseJPYfalsefalse1/1/2008 - 12/31/2008 JPY (¥) JPY (¥) / shares ¥TwelveMonthsEnded_31Dec2008http://www.sec.gov/CIK0000016988duration2008-01-01T00:00:002008-12-31T00:00:00PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0JPYStandardhttp://www.xbrl.org/2003/iso4217JPYiso42170JPYEPSDividehttp://www.xbrl.org/2003/iso4217JPYiso4217http://www.xbrl.org/2003/instancesharesxbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0JPYJPY¥3true0us-gaap_PropertyPlantAndEquipmentNetAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseProperty, plant and equipment4false0us-gaap_Landus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse266631000000266631falsetruefalsefalsefalse2truefalsefalse258824000000258824falsetruefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryCarrying amount as of the balance sheet date of real estate held for productive use. This excludes land held for sale.No authoritative reference available.falsefalseLand5false0us-gaap_BuildingsAndImprovementsGrossus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse13201210000001320121falsefalsefalsefalsefalse2truefalsefalse12991540000001299154falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryCarrying amount as of the balance sheet date of long-lived, depreciable assets that include building structures held for productive use including any addition, improvement, or renovation to the structure, such as interior masonry, interior flooring, electrical, and plumbing.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 falsefalseBuildings6false0us-gaap_MachineryAndEquipmentGrossus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse14392460000001439246falsefalsefalsefalsefalse2truefalsefalse14220760000001422076falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryCarrying amount as of the balance sheet date of long-lived, depreciable asset used in production process to produce goods and services.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 falsefalseMachinery and equipment7false0us-gaap_ConstructionInProgressGrossus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse8567300000085673falsefalsefalsefalsefalse2truefalsefalse105713000000105713falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryCarrying amount at the balance sheet date of long-lived asset under construction that include construction costs to date on capital projects that have not been completed and assets being constructed that are not ready to be placed into service.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 truefalseConstruction in progress8false0us-gaap_PropertyPlantAndEquipmentGrossus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse31116710000003111671falsefalsefalsefalsefalse2truefalsefalse30857670000003085767falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryCarrying amount at the balance sheet date for long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, physical structures, machinery, vehicles, furniture, computer equipment, construction in progress, and similar items. 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Examples include land, buildings, and production equipment.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 12 -Paragraph 5 -Subparagraph b, c Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 truefalseProperty, plant and equipment, Net11true0us-gaap_PropertyPlantAndEquipmentAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseProperty, Plant and Equipment (Textuals) [Abstract]12false0us-gaap_Depreciationus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse232327000000232327falsefalsefalsefalsefalse2truefalsefalse277399000000277399falsefalsefalsefalsefalse3truefalsefalse304622000000304622falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 falsefalseDepreciation expense13false0caj_AmountDueForPurchaseOfPropertyPlantAndEquipmentcajfalsedebitdurationThe amount due for purchase of property, plant and equipment at the balance sheet date.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse2330600000023306falsefalsefalsefalsefalse2truefalsefalse2903000000029030falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount due for purchase of property, plant and equipment at the balance sheet date.No authoritative reference available.falsefalseAmount due for purchase of property, plant and equipment14false0caj_ImpairmentLossesRelatedPrimarilyToPropertyPlantEquipmentOfSemiconductorProductionEquipmentBusinesscajfalsedebitinstantImpairment losses related primarily to property, plant equipment of semiconductor production equipment business.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse1539000000015390falsetruefalsefalsefalse3truefalsefalse1116400000011164falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryImpairment losses related primarily to property, plant equipment of semiconductor production equipment business.No authoritative reference available.falsefalseImpairment losses related primarily to property, plant equipment of semiconductor production equipment business312Property, Plant and Equipment (Details) (JPY ¥)MillionsUnKnownUnKnownUnKnownfalsetrue