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Borrowing Facilities and Debt - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended
Jun. 30, 2020
Feb. 29, 2020
Jul. 26, 2020
Aug. 01, 2021
Oct. 25, 2020
May 31, 2020
Aug. 31, 2019
Debt Instrument [Line Items]              
Commercial paper       $ 1,500,000,000      
Foreign Line of Credit              
Debt Instrument [Line Items]              
Available credit agreement       73,000,000      
Outstanding credit facilities       0 $ 0    
Unsecured Debt | Revolving Credit              
Debt Instrument [Line Items]              
Debt instrument, term   5 years          
Available credit agreement   $ 1,500,000,000          
Accordion feature, increase limit   500,000,000          
Accordion feature, higher borrowing capacity option   $ 2,000,000,000          
Outstanding credit facilities       0 0    
Unsecured Term Loan | Line of Credit              
Debt Instrument [Line Items]              
Available credit agreement             $ 2,000,000,000
Outstanding credit facilities       0 0    
Commercial paper              
Debt Instrument [Line Items]              
Short-term debt       0 0    
Senior Notes              
Debt Instrument [Line Items]              
Long-term debt, principal amount       5,500,000,000 5,500,000,000    
Senior Notes | 1.750% Senior Notes Due 2030              
Debt Instrument [Line Items]              
Long-term debt, principal amount       $ 750,000,000 750,000,000 $ 750,000,000  
Stated interest rate (as percent)       1.75%   1.75%  
Senior Notes | 2.750% Senior Notes Due 2050              
Debt Instrument [Line Items]              
Long-term debt, principal amount       $ 750,000,000 $ 750,000,000 $ 750,000,000  
Stated interest rate (as percent)       2.75%   2.75%  
Senior Notes | 2.625% Senior Notes Due 2020              
Debt Instrument [Line Items]              
Stated interest rate (as percent) 2.625%            
Repayments of long-term debt $ 600,000,000            
Senior Notes | 4.300% Senior Notes Due 2021              
Debt Instrument [Line Items]              
Stated interest rate (as percent) 4.30%            
Repayments of long-term debt $ 750,000,000            
Senior Notes | 4.300% Unsecured Senior Notes Due 2021 And 2.625% Unsecured Senior Notes Due 2020              
Debt Instrument [Line Items]              
Repayments of long-term debt $ 1,400,000,000            
Loss on extinguishment of debt     $ 33,000,000