Condensed Consolidated Financial Statement Details - Other Income/(Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest and dividend income	$ 1,049	$ 1,358	$ 2,094	$ 2,665
Interest expense	(757)	(1,010)	(1,542)	(1,900)
Other income/(expense), net	(10)	30	79	173
Total other income/(expense), net	$ 282	$ 378	$ 631	$ 938