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Goodwill and Other Intangible Assets, Schedule of Goodwill (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Feb. 28, 2015
Goodwill [Roll Forward]  
Net book value - Beginning Period $ 2,359us-gaap_Goodwill
Acquisitions 15,579us-gaap_GoodwillAcquiredDuringPeriod
Sale of business (706)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit [1]
Other (3)us-gaap_GoodwillOtherChanges [2]
Currency translation adjustments (185)us-gaap_GoodwillTranslationAdjustments
Net book value - Ending Period 17,044us-gaap_Goodwill
Retail Pharmacy USA [Member]  
Goodwill [Roll Forward]  
Net book value - Beginning Period 2,359us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= wxz_RetailPharmacyUSAMember
Acquisitions 8,311us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= wxz_RetailPharmacyUSAMember
Sale of business (706)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
/ us-gaap_StatementBusinessSegmentsAxis
= wxz_RetailPharmacyUSAMember		 [1]
Other (3)us-gaap_GoodwillOtherChanges
/ us-gaap_StatementBusinessSegmentsAxis
= wxz_RetailPharmacyUSAMember		 [2]
Currency translation adjustments 0us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= wxz_RetailPharmacyUSAMember
Net book value - Ending Period 9,961us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= wxz_RetailPharmacyUSAMember
Retail Pharmacy International [Member]  
Goodwill [Roll Forward]  
Net book value - Beginning Period 0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= wxz_RetailPharmacyInternationalMember
Acquisitions 3,747us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= wxz_RetailPharmacyInternationalMember
Sale of business 0us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
/ us-gaap_StatementBusinessSegmentsAxis
= wxz_RetailPharmacyInternationalMember		 [1]
Other 0us-gaap_GoodwillOtherChanges
/ us-gaap_StatementBusinessSegmentsAxis
= wxz_RetailPharmacyInternationalMember		 [2]
Currency translation adjustments (99)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= wxz_RetailPharmacyInternationalMember
Net book value - Ending Period 3,648us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= wxz_RetailPharmacyInternationalMember
Pharmaceutical Wholesale [Member]  
Goodwill [Roll Forward]  
Net book value - Beginning Period 0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= wxz_PharmaceuticalWholesaleMember
Acquisitions 3,521us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= wxz_PharmaceuticalWholesaleMember
Sale of business 0us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
/ us-gaap_StatementBusinessSegmentsAxis
= wxz_PharmaceuticalWholesaleMember		 [1]
Other 0us-gaap_GoodwillOtherChanges
/ us-gaap_StatementBusinessSegmentsAxis
= wxz_PharmaceuticalWholesaleMember		 [2]
Currency translation adjustments (86)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= wxz_PharmaceuticalWholesaleMember
Net book value - Ending Period $ 3,435us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= wxz_PharmaceuticalWholesaleMember
[1] Represents Walgreens Infusion and Respiratory Services goodwill that has been reclassified as an asset held for sale. See Note 22, Subsequent Events for further details.
[2] Other primarily represents immaterial purchase accounting adjustments for the Company's acquisitions.