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Debt - Additional Information (Details)
3 Months Ended
Nov. 30, 2019
USD ($)
Nov. 30, 2018
USD ($)
Aug. 30, 2019
USD ($)
credit_agreement
Jan. 18, 2019
USD ($)
Dec. 21, 2018
USD ($)
Dec. 05, 2018
USD ($)
Aug. 29, 2018
USD ($)
Debt Instrument [Line Items]              
Interest paid $ 245,000,000 $ 237,000,000          
Maximum              
Debt Instrument [Line Items]              
Debt to total capitalization ratio 0.60            
Commercial Paper              
Debt Instrument [Line Items]              
Average daily short-term borrowings $ 2,900,000,000 $ 1,800,000,000          
Weighted average interest rate 2.55% 2.61%          
Term Loan | December 2018 Term Loan Credit Agreement              
Debt Instrument [Line Items]              
Face amount           $ 1,000,000,000.0  
Borrowing outstanding $ 500,000,000            
Line of Credit | November 2018 Credit Agreement              
Debt Instrument [Line Items]              
Borrowing outstanding 700,000,000            
Credit facilities | August 2019 Revolving Credit Agreements              
Debt Instrument [Line Items]              
Number of credit agreements | credit_agreement     3        
Maximum borrowing capacity     $ 500,000,000        
Borrowing outstanding 0            
Credit facilities | January 2019 364-Day Revolving Credit Agreement              
Debt Instrument [Line Items]              
Maximum borrowing capacity       $ 2,000,000,000.0      
Borrowing outstanding 1,100,000,000            
Credit facilities | December 2018 Revolving Credit Agreement              
Debt Instrument [Line Items]              
Maximum borrowing capacity         $ 1,000,000,000.0    
Borrowing outstanding 300,000,000            
Credit facilities | August 2018 Revolving Credit Agreement              
Debt Instrument [Line Items]              
Face amount             $ 3,500,000,000
Borrowing outstanding $ 0            
Credit facilities | 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]              
Maximum borrowing capacity   $ 500,000,000          
Letter of Credit | August 2018 Revolving Credit Agreement              
Debt Instrument [Line Items]              
Face amount             $ 500,000,000