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Debt Debt (Summary of long-term debt maturities) (Details) - USD ($)
3 Months Ended
Dec. 30, 2018
Sep. 30, 2018
Short-term Debt [Line Items]    
2019 $ 0  
2020 1,250,000,000  
2021 500,000,000  
2022 1,000,000,000  
2023 1,520,300,000  
Thereafter 4,950,000,000  
Total 9,220,300,000 $ 9,548,400,000
Commercial Paper [Member]    
Short-term Debt [Line Items]    
Maximum allowable amount under Commercial Paper Program 3,000,000,000  
Outstanding commercial paper $ 0  
Maximum [Member] | Commercial Paper [Member]    
Short-term Debt [Line Items]    
Maximum allowable maturity period of credit under Commercial Paper Program 397 days