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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Nov. 30, 2014
Aug. 31, 2014
Nov. 30, 2013
Assets, Fair Value Disclosure [Abstract]      
Money market funds and other cash equivalents $ 11,605us-gaap_MoneyMarketFundsAtCarryingValue $ 1,879us-gaap_MoneyMarketFundsAtCarryingValue $ 360us-gaap_MoneyMarketFundsAtCarryingValue [1]
Interest rate swaps 26us-gaap_DerivativeAssets [2] 16us-gaap_DerivativeAssets [2] 23us-gaap_DerivativeAssets [2]
Investment in AmerisourceBergen 1,044wag_InvestmentInAmerisourcebergen [3] 887wag_InvestmentInAmerisourcebergen [3] 599wag_InvestmentInAmerisourcebergen [3]
Warrants 844wag_WarrantAssets [1] 553wag_WarrantAssets [1] 408wag_WarrantAssets [1]
Liabilities, Fair Value Disclosure [Abstract]      
Foreign currency forwards 96wag_ForeignCurrencyForwards [4]    
Forward interest rate swaps   44wag_ForwardInterestRateSwaps [5]  
Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Money market funds and other cash equivalents 11,605us-gaap_MoneyMarketFundsAtCarryingValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 1,879us-gaap_MoneyMarketFundsAtCarryingValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 360us-gaap_MoneyMarketFundsAtCarryingValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [1]
Interest rate swaps 0us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [2] 0us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [2] 0us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [2]
Investment in AmerisourceBergen 1,044wag_InvestmentInAmerisourcebergen
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [3] 887wag_InvestmentInAmerisourcebergen
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [3] 599wag_InvestmentInAmerisourcebergen
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [3]
Warrants 0wag_WarrantAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [1] 0wag_WarrantAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [1] 0wag_WarrantAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [1]
Liabilities, Fair Value Disclosure [Abstract]      
Foreign currency forwards 96wag_ForeignCurrencyForwards
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [4]    
Forward interest rate swaps   0wag_ForwardInterestRateSwaps
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [5]  
Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Money market funds and other cash equivalents 0us-gaap_MoneyMarketFundsAtCarryingValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 0us-gaap_MoneyMarketFundsAtCarryingValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 0us-gaap_MoneyMarketFundsAtCarryingValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [1]
Interest rate swaps 26us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [2] 16us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [2] 23us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [2]
Investment in AmerisourceBergen 0wag_InvestmentInAmerisourcebergen
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [3] 0wag_InvestmentInAmerisourcebergen
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [3] 0wag_InvestmentInAmerisourcebergen
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [3]
Warrants 844wag_WarrantAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [1] 553wag_WarrantAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [1] 408wag_WarrantAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [1]
Liabilities, Fair Value Disclosure [Abstract]      
Foreign currency forwards 0wag_ForeignCurrencyForwards
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [4]    
Forward interest rate swaps   44wag_ForwardInterestRateSwaps
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [5]  
Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Money market funds and other cash equivalents 0us-gaap_MoneyMarketFundsAtCarryingValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 0us-gaap_MoneyMarketFundsAtCarryingValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 0us-gaap_MoneyMarketFundsAtCarryingValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [1]
Interest rate swaps 0us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [2] 0us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [2] 0us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [2]
Investment in AmerisourceBergen 0wag_InvestmentInAmerisourcebergen
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [3] 0wag_InvestmentInAmerisourcebergen
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [3] 0wag_InvestmentInAmerisourcebergen
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [3]
Warrants 0wag_WarrantAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [1] 0wag_WarrantAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [1] 0wag_WarrantAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [1]
Liabilities, Fair Value Disclosure [Abstract]      
Foreign currency forwards 0wag_ForeignCurrencyForwards
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [4]    
Forward interest rate swaps   $ 0wag_ForwardInterestRateSwaps
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [5]  
[1] Warrants were valued using a Monte Carlo simulation. Key assumptions used in the valuation include risk-free interest rates using constant maturity treasury rates; the dividend yield for AmerisourceBergen's common stock; AmerisourceBergen's common stock price at the valuation date; AmerisourceBergen's equity volatility; the number of shares of AmerisourceBergen's common stock outstanding; the number of AmerisourceBergen employee stock options and the exercise price; and the details specific to the warrants.
[2] Interest rate swaps are valued using six-month and one-month LIBOR in arrears rates. See Note 9 for additional disclosure regarding financial instruments.
[3] The investment in AmerisourceBergen is valued using the closing stock price of AmerisourceBergen as of the balance sheet dates. See Note 6 for additional disclosures on available-for-sale investments.
[4] Foreign currency forwards are valued using published exchange rates on the respective balance sheet dates.
[5] Forward interest rate swaps are valued using three-month LIBOR in arrears rates. See Note 9 for additional disclosure regarding financial instruments.