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Acquisitions, Actual results from Alliance Boots operations included in the Consolidated Condensed Statements of Earnings (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Feb. 28, 2015
Feb. 28, 2014
Feb. 28, 2015
Feb. 28, 2014
Earnings Per Share [Abstract]        
Basic (in dollars per share) $ 1.96us-gaap_EarningsPerShareBasic $ 0.75us-gaap_EarningsPerShareBasic $ 2.91us-gaap_EarningsPerShareBasic $ 1.51us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) $ 1.93us-gaap_EarningsPerShareDiluted $ 0.74us-gaap_EarningsPerShareDiluted $ 2.88us-gaap_EarningsPerShareDiluted $ 1.49us-gaap_EarningsPerShareDiluted
Alliance Boots [Member]        
Business Acquisition [Line Items]        
Net sales $ 5,525us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= wxz_AllianceBootsMember
  $ 5,525us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= wxz_AllianceBootsMember
 
Net earnings $ 330us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= wxz_AllianceBootsMember
  $ 330us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= wxz_AllianceBootsMember
 
Earnings Per Share [Abstract]        
Basic (in dollars per share) $ 0.32us-gaap_EarningsPerShareBasic
/ us-gaap_BusinessAcquisitionAxis
= wxz_AllianceBootsMember
  $ 0.33us-gaap_EarningsPerShareBasic
/ us-gaap_BusinessAcquisitionAxis
= wxz_AllianceBootsMember
 
Diluted (in dollars per share) $ 0.31us-gaap_EarningsPerShareDiluted
/ us-gaap_BusinessAcquisitionAxis
= wxz_AllianceBootsMember
  $ 0.33us-gaap_EarningsPerShareDiluted
/ us-gaap_BusinessAcquisitionAxis
= wxz_AllianceBootsMember