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Debt (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 01, 2020
Jun. 27, 2020
Jun. 27, 2020
Jun. 29, 2019
Mar. 28, 2020
Sep. 28, 2019
Debt Instrument [Line Items]            
Document Period End Date     Jun. 27, 2020      
Repayments of Commercial Paper     $ 15,317 $ 12,970    
Repayments of Long-term Lines of Credit     1,280 $ 335    
Debt Instrument, Unamortized Discount   $ 46 46     $ 48
Term Loan Facility Due March 2022 [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Unused Borrowing Capacity, Amount         $ 1,500  
Long-term Debt, Gross $ 1,500 $ 1,500 $ 1,500     0
Debt Instrument, Interest Rate, Stated Percentage   1.69% 1.69%      
Notes due June 2020 (2020 Notes)            
Debt Instrument [Line Items]            
Long-term Debt, Gross   $ 0 $ 0     350
Extinguishment of Debt, Amount   350        
Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity   1,750 1,750      
Amount available for borrowing under credit facility   1,750 1,750      
Revolving credit facility   0 0     70
Repayments of Long-term Lines of Credit 200          
Standby Letters of Credit [Member]            
Debt Instrument [Line Items]            
Letters of Credit Outstanding, Amount   0 0      
Bilateral Letters Of Credit [Member]            
Debt Instrument [Line Items]            
Letters of Credit Outstanding, Amount   121 121      
Commercial paper            
Debt Instrument [Line Items]            
Maximum borrowing capacity   1,000 1,000      
Commercial paper   $ 0 $ 0     $ 1,000
Repayments of Commercial Paper $ 1,000