Consolidated Financial Statement Details - Other Income/(Expense), Net (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 28, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest and dividend income	$ 2,843	$ 3,763	$ 4,961
Interest expense	(2,645)	(2,873)	(3,576)
Other income/(expense), net	60	(87)	422
Total other income/(expense), net	$ 258	$ 803	$ 1,807