Leases (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jul. 03, 2021	Jul. 03, 2021	Jun. 27, 2020	Sep. 26, 2020
Operating Leases [Abstract]
Operating lease right-of-use assets	$ 577	$ 577		$ 562
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Operating lease right-of-use assets	Operating lease right-of-use assets		Operating lease right-of-use assets
Current operating lease liabilities	$ 114	$ 114		$ 115
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other Liabilities, Current	Other Liabilities, Current		Other Liabilities, Current
Noncurrent operating lease liabilities	$ 480	$ 480		$ 464
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Noncurrent operating lease liabilities	Noncurrent operating lease liabilities		Noncurrent operating lease liabilities
Finance Leases [Abstract]
Finance lease right-of-use assets	$ 62	$ 62		$ 78
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property, Plant and Equipment, Net	Property, Plant and Equipment, Net		Property, Plant and Equipment, Net
Current finance lease liability	$ 16	$ 16		$ 17
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Long-term Debt and Lease Obligation, Current	Long-term Debt and Lease Obligation, Current		Long-term Debt and Lease Obligation, Current
Noncurrent finance lease liabilities	$ 41	$ 41		$ 59
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Long-term debt, less current portion	Long-term debt, less current portion		Long-term debt, less current portion
Cash Paid for Amounts Included in Lease Liabilities [Abstract]
Operating cash flows from operating leases		$ 85	$ 86
Operating cash flows from finance leases		2	3
Financing cash flows from finance leases		19	$ 25
Right-of-use assets obtained in exchange for operating lease liabilities	$ 19	$ 53