Goodwill and Intangible Assets - Schedule of Intangible Assets, Net (Details) - USD ($) $ in Millions	Jun. 27, 2025	Sep. 27, 2024
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 3,534	$ 3,735
Accumulated Amortization	(1,459)	(1,112)
Total intangible assets, net	2,075	2,623
Backlog
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	923	931
Accumulated Amortization	(770)	(552)
Total intangible assets, net	153	379
Customer relationship intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	2,587	2,781
Accumulated Amortization	(677)	(550)
Total intangible assets, net	1,910	2,231
Capitalized software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	24	23
Accumulated Amortization	(12)	(10)
Total intangible assets, net	$ 12	$ 13