2.2.0.25falsefalse40801 - Disclosure - Fair Value Disclosures (Narrative) (Details)truefalseIn Millionsfalse1falsefalseUSDfalsefalse1/29/2011 USD ($) / shares USD ($) $As_Of_1_29_2011http://www.sec.gov/CIK0001166126instant2011-01-29T00:00:000001-01-01T00:00:00Unit14Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$5false0jcp_AccumulatedOtherComprehensiveIncomeUnrealizedHoldingGainLossOnRealEstateInvestmentArisingDuringPeriodNetOfTaxjcpfalsecreditinstantAccumulated Other Comprehensive Income Unrealized Holding Gain Loss On Real Estate Investment Arising During Period Net of...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse112000000112falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAccumulated Other Comprehensive Income Unrealized Holding Gain Loss On Real Estate Investment Arising During Period Net of TaxNo authoritative reference available.falsefalseNet unrealized gains on real estate investments, Net of Tax Amount11Fair Value Disclosures (Narrative) (Details) (USD $)MillionsUnKnownUnKnownUnKnownfalsetrue