Condensed Consolidated Financial Statement Details - Other Income/(Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest and dividend income	$ 1,190	$ 1,418	$ 3,855	$ 4,375
Interest expense	(866)	(846)	(2,766)	(2,372)
Other income/(expense), net	43	100	216	(301)
Total other income/(expense), net	$ 367	$ 672	$ 1,305	$ 1,702