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Borrowing Facilities and Debt (Narrative) (Details)
1 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
May 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Feb. 29, 2020
USD ($)
Aug. 31, 2019
USD ($)
interest_rate
Oct. 25, 2020
USD ($)
Oct. 27, 2019
USD ($)
Oct. 28, 2018
USD ($)
Jan. 31, 2020
USD ($)
Line of Credit Facility [Line Items]                  
Repayments of Long-term Debt           $ 2,882,000,000 $ 0 $ 0  
Commercial paper program amount           1,500,000,000      
Gain (loss) on extinguishment of debt $ (33,000,000)                
Commercial paper, corporate bonds and medium-term notes                  
Line of Credit Facility [Line Items]                  
Current portion of long-term debt           0 0    
Senior Notes                  
Line of Credit Facility [Line Items]                  
Long-term debt principal amount           5,500,000,000 4,750,000,000    
Senior Notes | 1.750% Senior Notes Due 2030                  
Line of Credit Facility [Line Items]                  
Long-term debt principal amount   $ 750,000,000       $ 750,000,000 0    
Stated interest rate   1.75%       1.75%      
Senior Notes | 2.750% Senior Notes Due 2050                  
Line of Credit Facility [Line Items]                  
Long-term debt principal amount   $ 750,000,000       $ 750,000,000 0    
Stated interest rate   2.75%       2.75%      
Senior Notes | 4.3% Percent Unsecured Senior Notes Due 2021 And 2.625% Percent Unsecured Senior Notes Due 2020                  
Line of Credit Facility [Line Items]                  
Repayments of Long-term Debt   $ 1,400,000,000              
Senior Notes | 4.300% Senior Notes Due 2021                  
Line of Credit Facility [Line Items]                  
Repayments of Long-term Debt $ 750,000,000                
Long-term debt principal amount           $ 0 750,000,000    
Stated interest rate 4.30%         4.30%      
Senior Notes | 2.625% Senior Notes Due 2020                  
Line of Credit Facility [Line Items]                  
Repayments of Long-term Debt $ 600,000,000                
Stated interest rate 2.625%         2.625%      
Revolving Credit | Unsecured Debt                  
Line of Credit Facility [Line Items]                  
Debt instrument term       5 years          
Available revolving credit agreement       $ 1,500,000,000         $ 1,500,000,000
Accordion feature, increase limit       500,000,000          
Line of Credit Facility, Accordion Feature, Higher Borrowing Capacity Option       $ 2,000,000,000.0          
Proceeds from Long-term Lines of Credit     $ 1,500,000,000            
Repayments of Long-term Debt   $ 1,500,000,000              
Amount outstanding           $ 0 0    
Revolving Credit | Unsecured Debt | London Interbank Offered Rate (LIBOR)                  
Line of Credit Facility [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate     0.875%            
Foreign Line of Credit                  
Line of Credit Facility [Line Items]                  
Available revolving credit agreement           76,000,000      
Amount outstanding           0 0    
Line of Credit | Unsecured Term Loan                  
Line of Credit Facility [Line Items]                  
Available revolving credit agreement         $ 2,000,000,000.0        
Amount outstanding           $ 0 $ 0    
Number of interest rates | interest_rate         2