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Short-Term Borrowings and Long-Term Debt, Long-Term Debt (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Feb. 28, 2015
Feb. 28, 2015
Aug. 31, 2014
Long-Term Debt [Abstract]      
Loans assumed through the purchase of land and buildings $ 41us-gaap_LoansPayable [1] $ 41us-gaap_LoansPayable [1] $ 40us-gaap_LoansPayable [1]
Other 117us-gaap_OtherLongTermDebt [1],[2] 117us-gaap_OtherLongTermDebt [1],[2] 0us-gaap_OtherLongTermDebt [1]
Total long-term debt including current maturities 16,003us-gaap_LongTermDebt [1] 16,003us-gaap_LongTermDebt [1] 3,744us-gaap_LongTermDebt [1]
Less: current maturities 2us-gaap_LongTermDebtCurrent [1] 2us-gaap_LongTermDebtCurrent [1] 8us-gaap_LongTermDebtCurrent [1]
Total long term debt 16,001us-gaap_LongTermDebtNoncurrent [1] 16,001us-gaap_LongTermDebtNoncurrent [1] 3,736us-gaap_LongTermDebtNoncurrent [1]
Notes Due 2015 [Member]      
Long-Term Debt [Abstract]      
Stated interest rate (in hundredths) 1.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2015Member		 1.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2015Member		  
Notes Due 2016 [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 750wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2016Member		 [1] 750wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2016Member		 [1] 0wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2016Member		 [1]
Maturity year 2016 [1]    
Notes Due 2019 [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 2,235wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesDue2019Member		 [1] 2,235wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesDue2019Member		 [1] 0wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesDue2019Member		 [1]
Maturity year 2019 [1]    
Notes Due 2017 One [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 999wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2017OneMember		 [1] 999wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2017OneMember		 [1] 999wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2017OneMember		 [1]
Stated interest rate (in hundredths) 1.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2017OneMember		 [1] 1.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2017OneMember		 [1]  
Maturity year 2017 [1]    
Notes Due 2017 Two [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 749wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2017TwoMember		 [1] 749wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2017TwoMember		 [1] 0wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2017TwoMember		 [1]
Stated interest rate (in hundredths) 1.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2017TwoMember		 [1] 1.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2017TwoMember		 [1]  
Maturity year 2017 [1]    
Notes Due 2019 One [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 1,016wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2019OneMember		 [1],[3] 1,016wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2019OneMember		 [1],[3] 1,010wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2019OneMember		 [1],[3]
Stated interest rate (in hundredths) 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2019OneMember		 [1],[3] 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2019OneMember		 [1],[3]  
Maturity year 2019 [1],[3]    
Notes Due 2019 Two [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 1,248wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2019TwoMember		 [1] 1,248wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2019TwoMember		 [1] 0wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2019TwoMember		 [1]
Stated interest rate (in hundredths) 2.70%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2019TwoMember		 [1] 2.70%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2019TwoMember		 [1]  
Maturity year 2019 [1]    
Notes Due 2020 [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 615wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2020Member		 [1],[4] 615wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2020Member		 [1],[4] 0wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2020Member		 [1],[4]
Stated interest rate (in hundredths) 2.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2020Member		 [1],[4] 2.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2020Member		 [1],[4]  
Maturity year 2020 [1],[4]    
Spot rate 1.54wxz_VariableSpotRate
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2020Member		 [1],[4] 1.54wxz_VariableSpotRate
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2020Member		 [1],[4]  
Notes Due 2021 [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 1,247wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2021Member		 [1] 1,247wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2021Member		 [1] 0wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2021Member		 [1]
Stated interest rate (in hundredths) 3.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2021Member		 [1] 3.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2021Member		 [1]  
Maturity year 2021 [1]    
Notes Due 2022 [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 1,199wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2022Member		 [1] 1,199wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2022Member		 [1] 1,199wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2022Member		 [1]
Stated interest rate (in hundredths) 3.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2022Member		 [1] 3.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2022Member		 [1]  
Maturity year 2022 [1]    
Notes Due 2024 [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 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]
Stated interest rate (in hundredths) 3.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2024Member		 [1] 3.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2024Member		 [1]  
Maturity year 2024 [1] 2024  
Notes Due 2025 [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 462wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2025Member		 [1],[4] 462wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2025Member		 [1],[4] 0wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2025Member		 [1],[4]
Stated interest rate (in hundredths) 3.60%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2025Member		 [1],[4] 3.60%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2025Member		 [1],[4]  
Maturity year 2025 [1],[4]    
Spot rate 1.54wxz_VariableSpotRate
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2025Member		 [1],[4] 1.54wxz_VariableSpotRate
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2025Member		 [1],[4]  
Notes Due 2026 [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 837wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2026Member		 [1],[5] 837wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2026Member		 [1],[5] 0wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2026Member		 [1],[5]
Stated interest rate (in hundredths) 2.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2026Member		 [1],[5] 2.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2026Member		 [1],[5]  
Maturity year 2026 [1],[5]    
Spot rate 1.12wxz_VariableSpotRate
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2026Member		 [1],[5] 1.12wxz_VariableSpotRate
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2026Member		 [1],[5]  
Notes Due 2034 [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 497wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2034Member		 [1] 497wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2034Member		 [1] 0wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2034Member		 [1]
Stated interest rate (in hundredths) 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2034Member		 [1] 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2034Member		 [1]  
Maturity year 2034 [1]    
Notes Due 2042 [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 496wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2042Member		 [1] 496wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2042Member		 [1] 496wxz_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2042Member		 [1]
Stated interest rate (in hundredths) 4.40%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2042Member		 [1] 4.40%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2042Member		 [1]  
Maturity year 2042 [1]    
Notes Due 2044 [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment $ 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]
Stated interest rate (in hundredths) 4.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2044Member		 [1] 4.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wxz_NotesPayableDue2044Member		 [1]  
Maturity year 2044 [1] 2044  
[1] All notes are presented net of unamortized discount, where applicable.
[2] Other long-term debt represents a mix of fixed and variable rate borrowings in various foreign currencies with various maturities.
[3] Also includes interest rate swap fair market value adjustments, see Note 11, Fair Value Measurements for additional fair value disclosures.
[4] Pound Sterling denominated notes are translated at the February 28, 2015 spot rate of $1.54 to one British Pound Sterling.
[5] Euro denominated notes are translated at the February 28, 2015 spot rate of $1.12 to one Euro.