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Debt (Summary of long-term debt maturities) (Details) - USD ($)
$ in Millions
6 Months Ended
Mar. 29, 2020
Sep. 29, 2019
Short-term Debt [Line Items]    
2020 $ 0.0  
2021 1,250.0  
2022 500.0  
2023 1,000.0  
2024 1,525.7  
Thereafter 8,700.0  
Total 12,975.7 $ 11,238.3
Commercial Paper [Member]    
Short-term Debt [Line Items]    
Maximum allowable amount under Commercial Paper Program $ 3,000.0  
Maximum [Member] | Commercial Paper [Member]    
Short-term Debt [Line Items]    
Maximum allowable maturity period of credit under Commercial Paper Program 397 days