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Debt (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Mar. 22, 2021
Feb. 10, 2021
Apr. 03, 2021
Mar. 28, 2020
Jan. 02, 2021
Oct. 03, 2020
Debt Instrument [Line Items]            
Document Period End Date     Apr. 03, 2021      
Repayments of Commercial Paper     $ 0 $ 12,885    
Repayments of Long-term Lines of Credit     0 1,080    
Debt Instrument, Unamortized Discount     43     $ 45
Term Loan Facility Due March 2022 [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Unused Borrowing Capacity, Amount       $ 1,500    
Long-term Debt, Gross   $ 750 $ 0   $ 1,500 1,500
Debt Instrument, Interest Rate, Stated Percentage          
Extinguishment of Debt, Amount $ 250 $ 750        
Term Loan Facility Due March 2023            
Debt Instrument [Line Items]            
Long-term Debt, Gross $ 500   $ 500     0
Debt Instrument, Interest Rate, Stated Percentage     0.91%      
Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity     $ 1,750      
Amount available for borrowing under credit facility     1,750      
Revolving credit facility     0     0
Standby Letters of Credit [Member]            
Debt Instrument [Line Items]            
Letters of Credit Outstanding, Amount     0      
Bilateral Letters Of Credit [Member]            
Debt Instrument [Line Items]            
Letters of Credit Outstanding, Amount     100      
Commercial paper            
Debt Instrument [Line Items]            
Maximum borrowing capacity     1,000      
Commercial paper     $ 0     $ 0