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Debt (Details) - USD ($)
$ in Millions
Dec. 27, 2019
Sep. 27, 2019
Debt    
Ownership percentage in TEGSA 100.00%  
Fair value of debt $ 4,292 $ 4,278
Commercial paper    
Debt    
Commercial paper $ 210 $ 219
Weighted-average interest rate (as a percent) 1.85% 2.20%