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Available-for-Sale Investments (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Feb. 28, 2014
Feb. 28, 2015
Feb. 28, 2014
Aug. 31, 2014
Summary of cost and fair value of available-for-sale securities [Abstract]        
Cost   $ 792us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis   $ 717us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
Unrealized gains   467wxz_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax   170wxz_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Foreign Exchange losses   (4)wxz_ForeignCurrencyTransactionGainsLossBeforeTax   0wxz_ForeignCurrencyTransactionGainsLossBeforeTax
Unrealized losses   0wxz_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax   0wxz_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Fair value   1,255us-gaap_AvailableForSaleSecuritiesEquitySecurities   887us-gaap_AvailableForSaleSecuritiesEquitySecurities
Available for sale securities, current   77us-gaap_AvailableForSaleSecuritiesCurrent    
AmerisourceBergen Common Stock [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Maximum number of shares in minority equity position   19,859,795us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
   
Percentage of rights to acquire common share (in hundredths)   7.00%wxz_PercentageOfRightsToAcquireCommonShare
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
   
Percentage of outstanding common stock held (in hundredths)   5.20%wxz_PercentageOfOutstandingCommonStock
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
   
Price of shares acquired through open market transactions 140wxz_ValueOfSharesAcquiredThroughOpenMarketTransactions
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
  430wxz_ValueOfSharesAcquiredThroughOpenMarketTransactions
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
 
Number of shares held   11,500,000us-gaap_InvestmentsInAndAdvancesToAffiliatesBalanceShares
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
   
Summary of cost and fair value of available-for-sale securities [Abstract]        
Cost   717us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
  717us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
Unrealized gains   461wxz_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
  170wxz_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
Foreign Exchange losses   0wxz_ForeignCurrencyTransactionGainsLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
  0wxz_ForeignCurrencyTransactionGainsLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
Unrealized losses   0wxz_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
  0wxz_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
Fair value   1,178us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
  887us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
Other Investments [Member]        
Summary of cost and fair value of available-for-sale securities [Abstract]        
Cost   75us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= wxz_OtherEquityInvestmentsEquitySecuritiesMember
   
Unrealized gains   6wxz_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= wxz_OtherEquityInvestmentsEquitySecuritiesMember
   
Foreign Exchange losses   (4)wxz_ForeignCurrencyTransactionGainsLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= wxz_OtherEquityInvestmentsEquitySecuritiesMember
   
Unrealized losses   0wxz_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= wxz_OtherEquityInvestmentsEquitySecuritiesMember
   
Fair value   $ 77us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= wxz_OtherEquityInvestmentsEquitySecuritiesMember