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Short-Term Borrowings and Long-Term Debt, Long-Term Debt (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Nov. 30, 2014
Aug. 31, 2014
Nov. 30, 2013
Long-Term Debt [Abstract]      
Loans assumed through the purchase of land and buildings $ 40us-gaap_LoansPayable $ 40us-gaap_LoansPayable $ 42us-gaap_LoansPayable
Total long-term debt including current maturities 13,763us-gaap_LongTermDebt 3,744us-gaap_LongTermDebt 4,503us-gaap_LongTermDebt
Less current maturities (7)us-gaap_LongTermDebtCurrent (8)us-gaap_LongTermDebtCurrent (2)us-gaap_LongTermDebtCurrent
Total long term debt 13,756us-gaap_LongTermDebtNoncurrent 3,736us-gaap_LongTermDebtNoncurrent 4,501us-gaap_LongTermDebtNoncurrent
Notes Due 2015 [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 0wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2015Member		 0wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2015Member		 750wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2015Member
Stated interest rate (in hundredths) 1.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2015Member		    
Maturity year 2015    
Notes Due 2016 [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 750wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2016Member		 0wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2016Member		 0wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2016Member
Maturity year 2016    
Notes Due 2017 One [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 999wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2017OneMember		 999wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2017OneMember		 998wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2017OneMember
Stated interest rate (in hundredths) 1.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2017OneMember		    
Maturity year 2017    
Notes Due 2017 Two [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 749wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2017TwoMember		 0wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2017TwoMember		 0wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2017TwoMember
Stated interest rate (in hundredths) 1.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2017TwoMember		    
Maturity year 2017    
Notes Due 2019 One [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 1,019wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2019OneMember		 [1] 1,010wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2019OneMember		 [1] 1,018wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2019OneMember		 [1]
Stated interest rate (in hundredths) 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2019OneMember		    
Maturity year 2019    
Notes Due 2019 Two [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 1,248wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2019TwoMember		 0wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2019TwoMember		 0wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2019TwoMember
Stated interest rate (in hundredths) 2.70%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2019TwoMember		    
Maturity year 2019    
Notes Due 2020 [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 624wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2020Member		 [2] 0wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2020Member		 [2] 0wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2020Member		 [2]
Stated interest rate (in hundredths) 2.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2020Member		    
Maturity year 2020    
Spot rate 1.56wag_VariableSpotRate
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2020Member		    
Notes Due 2021 [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 1,247wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2021Member		 0wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2021Member		 0wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2021Member
Stated interest rate (in hundredths) 3.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2021Member		    
Maturity year 2021    
Notes Due 2022 [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 1,199wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2022Member		 1,199wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2022Member		 1,199wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2022Member
Stated interest rate (in hundredths) 3.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2022Member		    
Maturity year 2022    
Notes Due 2024 [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 1,995wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2024Member		 0wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2024Member		 0wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2024Member
Stated interest rate (in hundredths) 3.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2024Member		    
Maturity year 2024    
Notes Due 2025 [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 469wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2025Member		 [2] 0wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2025Member		 [2] 0wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2025Member		 [2]
Stated interest rate (in hundredths) 3.60%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2025Member		    
Maturity year 2025    
Spot rate 1.56wag_VariableSpotRate
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2025Member		    
Notes Due 2026 [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 931wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2026Member		 [3] 0wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2026Member		 [3] 0wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2026Member		 [3]
Stated interest rate (in hundredths) 2.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2026Member		    
Maturity year 2026    
Spot rate 1.24wag_VariableSpotRate
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2026Member		    
Notes Due 2034 [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 497wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2034Member		 0wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2034Member		 0wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2034Member
Stated interest rate (in hundredths) 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2034Member		    
Maturity year 2034    
Notes Due 2042 [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment 496wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2042Member		 496wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2042Member		 496wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2042Member
Stated interest rate (in hundredths) 4.40%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2042Member		    
Maturity year 2042    
Notes Due 2044 [Member]      
Long-Term Debt [Abstract]      
Carrying value of notes, net of unamortized discount and interest rate swap FMV adjustment $ 1,500wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2044Member		 $ 0wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2044Member		 $ 0wag_LongTermDebtNetDiscountAndFairMarketValueAdjustments
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2044Member
Stated interest rate (in hundredths) 4.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wag_NotesPayableDue2044Member		    
Maturity year 2044    
[1] Also includes interest rate swap fair market value adjustments, see Note 10 for additional fair value disclosures.
[2] Pound Sterling denominated notes are translated at the November 30, 2014 spot rate of $1.56 to one British Pound Sterling.
[3] Euro denominated notes are translated at the November 30, 2014 spot rate of $1.24 to one Euro.