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Financial Instruments, Textual Information (Details)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended
Feb. 28, 2015
USD ($)
Jan. 31, 2015
GBP (£)
Aug. 31, 2014
USD ($)
Feb. 28, 2015
Warrants Exercisable in March 2016 [Member]
USD ($)
Feb. 28, 2015
Warrants Exercisable in March 2017 [Member]
USD ($)
Feb. 28, 2015
Alliance Boots [Member]
USD ($)
Feb. 28, 2015
Notes Due 2024 [Member]
USD ($)
Feb. 28, 2015
Notes Due 2024 [Member]
USD ($)
Aug. 31, 2014
Notes Due 2024 [Member]
USD ($)
Feb. 28, 2015
Notes Due 2044 [Member]
USD ($)
Feb. 28, 2015
Notes Due 2044 [Member]
USD ($)
Aug. 31, 2014
Notes Due 2044 [Member]
USD ($)
Feb. 28, 2015
Three-month LIBOR [Member]
USD ($)
Feb. 28, 2015
Three-month LIBOR [Member]
Contract One [Member]
USD ($)
Feb. 28, 2015
Three-month LIBOR [Member]
Contract Two [Member]
USD ($)
Feb. 28, 2015
Interest Rate Swap [Member]
Feb. 28, 2015
Interest Rate Swap [Member]
one-month LIBOR [Member]
USD ($)
Feb. 28, 2015
Interest Rate Swap [Member]
six-month LIBOR [Member]
USD ($)
Feb. 28, 2015
Interest Rate Cap [Member]
EUR (€)
Jan. 31, 2015
Interest Rate Cap [Member]
EUR (€)
Derivative [Line Items]                                        
Derivative instrument fair value hedge                                 $ 250us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
/ wxz_DerivativeDescriptionReferenceRateAxis
= wxz_OneMonthLiborMember		 $ 750us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
/ wxz_DerivativeDescriptionReferenceRateAxis
= wxz_SixMonthLiborMember		    
Fixed interest rate percentage (in hundredths)                                 5.25%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
/ wxz_DerivativeDescriptionReferenceRateAxis
= wxz_OneMonthLiborMember		 5.25%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
/ wxz_DerivativeDescriptionReferenceRateAxis
= wxz_SixMonthLiborMember		    
Cumulative fair value adjustments resulted in increase in long-term debt 18us-gaap_LongTermDebtFairValue   12us-gaap_LongTermDebtFairValue                                  
Debt instrument, maturity period                           10 years 30 years          
Debt issuance             1,995wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2024Member		 [1] 1,995wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2024Member		 [1] 0wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2024Member		 [1] 1,500wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2044Member		 [1] 1,500wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2044Member		 [1] 0wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2044Member		 [1]                
Maturity year             2024 [1] 2024   2044 [1] 2044                  
Cash paid to settle swap                           45wxz_DerivativeInstrumentCashPaidToSettleSwap
/ wxz_DerivativeDescriptionReferenceRateAxis
= wxz_ThreeMonthLiborMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 18wxz_DerivativeInstrumentCashPaidToSettleSwap
/ wxz_DerivativeDescriptionReferenceRateAxis
= wxz_ThreeMonthLiborMember
/ us-gaap_DerivativeInstrumentRiskAxis
= wxz_InterestRateContractTwoMember		          
Outstanding debt 16,003us-gaap_LongTermDebt [1]   3,744us-gaap_LongTermDebt [1]     9,000us-gaap_LongTermDebt
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wxz_AllianceBootsMember		                            
Value of Interest rate swap terminated   1,000wxz_ValueOfInterestRateSwapTerminated                                    
Derivative maturity date                               Jul. 31, 2015        
Derivative notional principal amount                         1,500us-gaap_DerivativeAssetNotionalAmount
/ wxz_DerivativeDescriptionReferenceRateAxis
= wxz_ThreeMonthLiborMember		           2,000us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateCapMember		  
Derivative notional amount terminated                                       € 600wxz_DerivativeNotionalAmountTerminated
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateCapMember
Class of Warrant or Right [Line Items]                                        
Warrant issued to purchase common stock (in share)       22,696,912us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= wxz_WarrantsExercisableInMarch2016Member		 22,696,912us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= wxz_WarrantsExercisableInMarch2017Member		                              
Warrant exercise price (in dollars per share)       $ 51.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= wxz_WarrantsExercisableInMarch2016Member		 $ 52.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= wxz_WarrantsExercisableInMarch2017Member		                              
[1] All notes are presented net of unamortized discount, where applicable.