2.2.0.25truefalse009060 - Disclosure - Stock Based Compensation (Details)truefalseIn Millions, except Share datafalse1falsefalseUSDfalsefalse9/1/2010 - 2/28/2011 USD ($) USD ($) / shares $c00053http://www.sec.gov/CIK0000104207duration2010-09-01T00:00:002011-02-28T00:00:00u000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170u003Standardhttp://www.xbrl.org/2003/instancepurexbrli0u001Standardhttp://www.xbrl.org/2003/instancesharesxbrli0u002Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2falsefalseUSDfalsefalse9/1/2009 - 2/28/2010 USD ($) USD ($) / shares $c00077http://www.sec.gov/CIK0000104207duration2009-09-01T00:00:002010-02-28T00:00:00u000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170u002Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0u001Standardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$3falsefalseUSDtruefalse{us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis} : Executive Stock Option Plan And Stock Purchase Plan [Member] 12/1/2010 - 2/28/2011 USD ($) $c00101http://www.sec.gov/CIK0000104207duration2010-12-01T00:00:002011-02-28T00:00:00falsefalseWalgreen Co. Executive Stock Option Plan and the Walgreen Co. Stock Purchase/Option Plan [Member]us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisxbrldihttp://xbrl.org/2006/xbrldiwag_ExecutiveStockOptionPlanAndStockPurchasePlanMemberus-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisexplicitMemberu001Standardhttp://www.xbrl.org/2003/instancesharesxbrli0u000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$4falsefalseUSDtruefalse{us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis} : Executive Stock Option Plan And Stock Purchase Plan [Member] 12/1/2009 - 2/28/2010 USD ($) $c00114http://www.sec.gov/CIK0000104207duration2009-12-01T00:00:002010-02-28T00:00:00falsefalseWalgreen Co. Executive Stock Option Plan and the Walgreen Co. Stock Purchase/Option Plan [Member]us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisxbrldihttp://xbrl.org/2006/xbrldiwag_ExecutiveStockOptionPlanAndStockPurchasePlanMemberus-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisexplicitMemberu000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170u001Standardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$5falsefalseUSDtruefalse{us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis} : Executive Stock Option Plan And Stock Purchase Plan [Member] 9/1/2010 - 2/28/2011 USD ($) $c00069http://www.sec.gov/CIK0000104207duration2010-09-01T00:00:002011-02-28T00:00:00falsefalseWalgreen Co. Executive Stock Option Plan and the Walgreen Co. Stock Purchase/Option Plan [Member]us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisxbrldihttp://xbrl.org/2006/xbrldiwag_ExecutiveStockOptionPlanAndStockPurchasePlanMemberus-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisexplicitMemberu000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170u001Standardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$6falsefalseUSDtruefalse{us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis} : Executive Stock Option Plan And Stock Purchase Plan [Member] 9/1/2009 - 2/28/2010 USD ($) $c00086http://www.sec.gov/CIK0000104207duration2009-09-01T00:00:002010-02-28T00:00:00falsefalseWalgreen Co. Executive Stock Option Plan and the Walgreen Co. Stock Purchase/Option Plan [Member]us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisxbrldihttp://xbrl.org/2006/xbrldiwag_ExecutiveStockOptionPlanAndStockPurchasePlanMemberus-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisexplicitMemberu001Standardhttp://www.xbrl.org/2003/instancesharesxbrli0u000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$7falsefalsetruefalse{us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis} : Restricted Stock Unit Award Program [Member] 12/1/2010 - 2/28/2011 c00102http://www.sec.gov/CIK0000104207duration2010-12-01T00:00:002011-02-28T00:00:00falsefalseWalgreen Co. Restricted Stock Unit Award Program [Member]us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisxbrldihttp://xbrl.org/2006/xbrldiwag_RestrictedStockUnitAwardProgramMemberus-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisexplicitMemberu001Standardhttp://www.xbrl.org/2003/instancesharesxbrli08falsefalsetruefalse{us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis} : Restricted Stock Unit Award Program [Member] 12/1/2009 - 2/28/2010 c00115http://www.sec.gov/CIK0000104207duration2009-12-01T00:00:002010-02-28T00:00:00falsefalseWalgreen Co. Restricted Stock Unit Award Program [Member]us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisxbrldihttp://xbrl.org/2006/xbrldiwag_RestrictedStockUnitAwardProgramMemberus-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisexplicitMemberu001Standardhttp://www.xbrl.org/2003/instancesharesxbrli09falsefalsetruefalse{us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis} : Restricted Stock Unit Award Program [Member] 9/1/2010 - 2/28/2011 c00070http://www.sec.gov/CIK0000104207duration2010-09-01T00:00:002011-02-28T00:00:00falsefalseWalgreen Co. Restricted Stock Unit Award Program [Member]us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisxbrldihttp://xbrl.org/2006/xbrldiwag_RestrictedStockUnitAwardProgramMemberus-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisexplicitMemberu001Standardhttp://www.xbrl.org/2003/instancesharesxbrli010falsefalsetruefalse{us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis} : Restricted Stock Unit Award Program [Member] 9/1/2009 - 2/28/2010 c00087http://www.sec.gov/CIK0000104207duration2009-09-01T00:00:002010-02-28T00:00:00falsefalseWalgreen Co. Restricted Stock Unit Award Program [Member]us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisxbrldihttp://xbrl.org/2006/xbrldiwag_RestrictedStockUnitAwardProgramMemberus-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisexplicitMemberu001Standardhttp://www.xbrl.org/2003/instancesharesxbrli011falsefalsetruefalse{us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis} : Performance Share Program [Member] 12/1/2010 - 2/28/2011 c00103http://www.sec.gov/CIK0000104207duration2010-12-01T00:00:002011-02-28T00:00:00falsefalseWalgreen Co. Performance Share Program [Member]us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisxbrldihttp://xbrl.org/2006/xbrldiwag_PerformanceShareProgramMemberus-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisexplicitMemberu001Standardhttp://www.xbrl.org/2003/instancesharesxbrli012falsefalsetruefalse{us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis} : Performance Share Program [Member] 12/1/2009 - 2/28/2010 c00116http://www.sec.gov/CIK0000104207duration2009-12-01T00:00:002010-02-28T00:00:00falsefalseWalgreen Co. Performance Share Program [Member]us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisxbrldihttp://xbrl.org/2006/xbrldiwag_PerformanceShareProgramMemberus-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisexplicitMemberu001Standardhttp://www.xbrl.org/2003/instancesharesxbrli013falsefalsetruefalse{us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis} : Performance Share Program [Member] 9/1/2010 - 2/28/2011 c00071http://www.sec.gov/CIK0000104207duration2010-09-01T00:00:002011-02-28T00:00:00falsefalseWalgreen Co. Performance Share Program [Member]us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisxbrldihttp://xbrl.org/2006/xbrldiwag_PerformanceShareProgramMemberus-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisexplicitMemberu001Standardhttp://www.xbrl.org/2003/instancesharesxbrli014falsefalsetruefalse{us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis} : Performance Share Program [Member] 9/1/2009 - 2/28/2010 c00088http://www.sec.gov/CIK0000104207duration2009-09-01T00:00:002010-02-28T00:00:00falsefalseWalgreen Co. Performance Share Program [Member]us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisxbrldihttp://xbrl.org/2006/xbrldiwag_PerformanceShareProgramMemberus-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisexplicitMemberu001Standardhttp://www.xbrl.org/2003/instancesharesxbrli015falsefalseUSDtruefalse{us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis} : Total Restricted Stock Unit Award Program And Performance Share Program [Member] 12/1/2010 - 2/28/2011 USD ($) $c00104http://www.sec.gov/CIK0000104207duration2010-12-01T00:00:002011-02-28T00:00:00falsefalseTotal Walgreen Co. Restricted Stock Unit Award Program and Walgreen Co. Performance Share Program [Member]us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisxbrldihttp://xbrl.org/2006/xbrldiwag_TotalRestrictedStockUnitAwardProgramAndPerformanceShareProgramMemberus-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisexplicitMemberu000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$16falsefalseUSDtruefalse{us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis} : Total Restricted Stock Unit Award Program And Performance Share Program [Member] 12/1/2009 - 2/28/2010 USD ($) $c00117http://www.sec.gov/CIK0000104207duration2009-12-01T00:00:002010-02-28T00:00:00falsefalseTotal Walgreen Co. Restricted Stock Unit Award Program and Walgreen Co. Performance Share Program [Member]us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisxbrldihttp://xbrl.org/2006/xbrldiwag_TotalRestrictedStockUnitAwardProgramAndPerformanceShareProgramMemberus-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisexplicitMemberu000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$17falsefalseUSDtruefalse{us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis} : Total Restricted Stock Unit Award Program And Performance Share Program [Member] 9/1/2010 - 2/28/2011 USD ($) $c00072http://www.sec.gov/CIK0000104207duration2010-09-01T00:00:002011-02-28T00:00:00falsefalseTotal Walgreen Co. Restricted Stock Unit Award Program and Walgreen Co. Performance Share Program [Member]us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisxbrldihttp://xbrl.org/2006/xbrldiwag_TotalRestrictedStockUnitAwardProgramAndPerformanceShareProgramMemberus-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisexplicitMemberu000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$18falsefalseUSDtruefalse{us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis} : Total Restricted Stock Unit Award Program And Performance Share Program [Member] 9/1/2009 - 2/28/2010 USD ($) $c00089http://www.sec.gov/CIK0000104207duration2009-09-01T00:00:002010-02-28T00:00:00falsefalseTotal Walgreen Co. Restricted Stock Unit Award Program and Walgreen Co. Performance Share Program [Member]us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisxbrldihttp://xbrl.org/2006/xbrldiwag_TotalRestrictedStockUnitAwardProgramAndPerformanceShareProgramMemberus-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxisexplicitMemberu000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2true0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItemsus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse00falsefalsefalsetruefalse14falsefalsefalse00falsefalsefalsetruefalse15falsefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalseOtherxbrli:stringItemTypestringLine items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.falsefalseShare-based Compensation Arrangement by Share-based Payment Award [Line Items]3false0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3truefalsefalse192583192583falsefalsefalsetruefalse4truefalsefalse476333476333falsefalsefalsetruefalse5truefalsefalse82985018298501falsefalsefalsetruefalse6truefalsefalse74266397426639falsefalsefalsetruefalse7truefalsefalse2438724387falsefalsefalsetruefalse8truefalsefalse8831888318falsefalsefalsetruefalse9truefalsefalse783344783344falsefalsefalsetruefalse10truefalsefalse687435687435falsefalsefalsetruefalse11truefalsefalse1932419324falsefalsefalsetruefalse12truefalsefalse1675516755falsefalsefalsetruefalse13truefalsefalse806791806791falsefalsefalsetruefalse14truefalsefalse619323619323falsefalsefalsetruefalse15falsefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalseSharesxbrli:sharesItemTypesharesThe quantity of shares issuable on stock options awarded under the plan during the reporting period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(d) falsefalseNumber of options granted in period4false0us-gaap_ShareBasedCompensationus-gaaptruedebitdurationNo definition available.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:monetaryItemTypemonetaryThe aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock options, amortization of restricted stock, and adjustment for officers compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 falsefalseTotal stock based compensation expense for the period5false0wag_AllocatedShareBasedCompensationFullyRecognizedRetireeEligibleExpensewagfalsedebitdurationThe amount of expense recognized during the period for options issued to all employees that are retiree eligible.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3truefalsefalse00falsetruefalsetruefalse4truefalsefalse00falsetruefalsetruefalse5truefalsefalse50000005falsetruefalsetruefalse6truefalsefalse60000006falsetruefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse00falsefalsefalsetruefalse14falsefalsefalse00falsefalsefalsetruefalse15falsefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of expense recognized during the period for options issued to all employees that are retiree eligible.No authoritative reference available.falsefalseFully recognized retiree eligible expense6false0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7truefalsefalse76847684falsefalsefalsetruefalse8truefalsefalse43224322falsefalsefalsetruefalse9truefalsefalse1707717077falsefalsefalsetruefalse10truefalsefalse79777977falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse00falsefalsefalsetruefalse14falsefalsefalse00falsefalsefalsetruefalse15falsefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalseSharesxbrli:sharesItemTypesharesThe number of shares issuable under a share-based award plan pertaining to grants made during the period on other than stock option plans (for example, phantom stock plan, stock appreciation rights plan, performance target plan).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) falsefalseNumber of other than options granted during the period7false0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse003Y3Yfalsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse003Y3Yfalsefalsefalsetruefalse14falsefalsefalse00falsefalsefalsetruefalse15falsefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalseOtherus-types:durationStringItemTypenormalizedstringDescription of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a falsefalseVesting schedule (in years) for the other than option awards186Stock Based Compensation (Details) (USD $)MillionsNoRoundingUnKnownUnKnownfalsetrue