Basis of Presentation and Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Dec. 28, 2018	Mar. 29, 2019	Sep. 28, 2018
Revenue Recognition
Practical expedient with respect to financing components		true
Optional exemption not to disclose aggregate amount of transaction prices associated with unsatisfied or partially satisfied performance obligations		true
Recently Adopted Accounting Pronouncements
Other assets		$ 391	$ 1,158
Deferred tax assets		2,607	2,144
Prepaid expenses and other current assets		448	$ 661
ASU 2016-16
Recently Adopted Accounting Pronouncements
Cumulative-effect adjustment	$ 443	$ 443
Other assets	(798)
Deferred tax assets	418
Prepaid expenses and other current assets	$ (63)