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Goodwill and Intangible Assets - Schedule of Changes in the Carrying Amount of Goodwill (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 27, 2024
Sep. 27, 2024
Sep. 29, 2023
Sep. 30, 2022
Goodwill [Roll Forward]        
Goodwill, beginning balance   $ 2,891 $ 3,002  
Acquisition of PAE / CMS   2,665 75  
Goodwill impairment charges $ 0 0 (186) $ (108)
Goodwill, ending balance $ 5,556 $ 5,556 $ 2,891 $ 3,002