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Long-term Debt and Other Financing Arrangements - Additional Information (Details)
$ / shares in Units, € in Millions
1 Months Ended
Mar. 18, 2020
USD ($)
Mar. 17, 2020
USD ($)
Apr. 30, 2020
USD ($)
Jul. 31, 2019
USD ($)
May 31, 2020
USD ($)
$ / shares
May 27, 2020
$ / shares
Jul. 31, 2019
EUR (€)
May 31, 2019
USD ($)
Line Of Credit Facility [Line Items]                
Long-term debt weighted-average interest rate         3.60%      
Long term debt, including current maturities and exclusive of finance leases fair value         $ 22,800,000,000     $ 17,800,000,000
Letter of credit maximum sublimit amount   $ 250,000,000            
Repayments of commercial paper     $ 136,000,000          
Financial Covenant Terms Ratio         350.00%      
Financial covenant compliance ratio, May 31, 2020           375.00%    
Financial covenant compliance ratio, August 31, 2020           475.00%    
Financial covenant compliance ratio, November 30, 2020           490.00%    
Financial covenant compliance ratio, February 28, 2021           475.00%    
Financial covenant compliance ratio, May 31, 2021           375.00%    
Financial covenant compliance ratio, August 31, 2021           350.00%    
Dividends payable amount per share | $ / shares         $ 0.65 $ 0.65    
Financial covenant compliance ratio         300.00%      
Letter of credit outstanding sublimit unused amount         $ 250,000,000      
Commercial paper outstanding         $ 0      
Payable at August 31, 2020 [Member]                
Line Of Credit Facility [Line Items]                
Dividends payable amount per share | $ / shares           0.65    
Payable at November 30, 2020 [Member]                
Line Of Credit Facility [Line Items]                
Dividends payable amount per share | $ / shares           0.65    
Payable at February 28, 2021 [Member]                
Line Of Credit Facility [Line Items]                
Dividends payable amount per share | $ / shares           0.65    
Payable at May 31, 2021 [Member]                
Line Of Credit Facility [Line Items]                
Dividends payable amount per share | $ / shares           $ 0.65    
Five-Year Credit Agreement [Member]                
Line Of Credit Facility [Line Items]                
Line of Credit Facility, Term   5 years            
Line Of Credit Facility Maximum Borrowing Capacity   $ 2,000,000,000.0            
Line of credit facility, expiration date   2025-03            
364-Day Credit Agreement [Member]                
Line Of Credit Facility [Line Items]                
Line of Credit Facility, Term   364 days 364 days          
Line Of Credit Facility Maximum Borrowing Capacity   $ 1,500,000,000            
Line of credit facility, expiration date   2021-03            
Proceeds from credit agreement $ 1,500,000,000              
Repayments of lines of credit     $ 1,500,000,000          
Senior Unsecured Debt [Member]                
Line Of Credit Facility [Line Items]                
Debt instrument, face amount     3,000,000,000.0 $ 2,100,000,000        
3.10% Fixed-rate Notes Due in August 2029 [Member]                
Line Of Credit Facility [Line Items]                
Debt instrument, face amount       $ 1,000,000,000.0        
Fixed interest rate       3.10%     3.10%  
Debt instrument, maturity date       2029-08        
0.45% Fixed-rate Notes Due in August 2025 [Member]                
Line Of Credit Facility [Line Items]                
Debt instrument, face amount | €             € 500  
Fixed interest rate       0.45%     0.45%  
Debt instrument, maturity date       2025-08        
1.30% Fixed-rate Notes Due in August 2031 [Member]                
Line Of Credit Facility [Line Items]                
Debt instrument, face amount | €             € 500  
Fixed interest rate       1.30%     1.30%  
Debt instrument, maturity date       2031-08        
2.30% Fixed-rate Notes Due in February 1 2020 [Member]                
Line Of Credit Facility [Line Items]                
Debt instrument, face amount       $ 400,000,000        
Fixed interest rate       2.30%     2.30%  
Debt instrument, maturity date       Feb. 01, 2020        
0.50% Notes Due April 09, 2020 [Member]                
Line Of Credit Facility [Line Items]                
Debt instrument, face amount | €             € 500  
Fixed interest rate       0.50%     0.50%  
Debt instrument, maturity date       Apr. 09, 2020        
3.80% Fixed-rate Notes Due in May 2025 [Member]                
Line Of Credit Facility [Line Items]                
Debt instrument, face amount     $ 1,000,000,000.0          
Fixed interest rate     3.80%          
Debt instrument, maturity date     2025-05          
4.25% Fixed-rate Notes Due in May 2030 [Member]                
Line Of Credit Facility [Line Items]                
Debt instrument, face amount     $ 750,000,000          
Fixed interest rate     4.25%          
Debt instrument, maturity date     2030-05          
5.25% Fixed-rate Notes Due in May 2050 [Member]                
Line Of Credit Facility [Line Items]                
Debt instrument, face amount     $ 1,250,000,000          
Fixed interest rate     5.25%          
Debt instrument, maturity date     2050-05