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Debt - Additional Information (Details)
3 Months Ended
Nov. 30, 2018
USD ($)
Nov. 30, 2017
USD ($)
Aug. 29, 2018
USD ($)
Aug. 24, 2017
USD ($)
Feb. 01, 2017
USD ($)
Debt Instrument [Line Items]          
Average daily short-term borrowings $ 1,800,000,000 $ 600,000,000      
Weighted-average interest rate 2.61% 1.46%      
Interest paid $ 237,000,000 $ 217,000,000      
Line of Credit | November 2018 Credit Agreement          
Debt Instrument [Line Items]          
Borrowing outstanding 1,000,000,000        
Medium-term Notes | February 2017 Revolving Credit Agreement          
Debt Instrument [Line Items]          
Maximum borrowing capacity         $ 1,000,000,000.0
Borrowing outstanding 0        
Medium-term Notes | August 2017 Revolving Credit Agreement          
Debt Instrument [Line Items]          
Maximum borrowing capacity       $ 1,000,000,000.0  
Borrowing outstanding 0        
Medium-term Notes | 2017 Term Loan Agreement          
Debt Instrument [Line Items]          
Maximum borrowing capacity       $ 1,000,000,000.0  
Borrowing outstanding 0        
Revolving Credit Facility | 2018 Revolving Credit Agreement          
Debt Instrument [Line Items]          
Face amount     $ 3,500,000,000.0    
Borrowing outstanding 0        
Revolving Credit Facility | Line of Credit | November 2018 Credit Agreement          
Debt Instrument [Line Items]          
Maximum borrowing capacity 500,000,000        
Unsecured Debt | Line of Credit | November 2018 Credit Agreement          
Debt Instrument [Line Items]          
Face amount $ 500,000,000        
Letter of Credit | 2018 Revolving Credit Agreement          
Debt Instrument [Line Items]          
Face amount     $ 500,000,000    
Term Loan | Maximum          
Debt Instrument [Line Items]          
Debt to total capitalization ratio 0.60