Reconciliation of Cash, Cash Equivalents and Restricted Cash Reported in the Condensed Consolidated Balance Sheet to the Total Amount in the Condensed Consolidated Statements of Cash Flows (Details) - USD ($) $ in Millions	Jun. 27, 2020	Sep. 28, 2019	Jun. 29, 2019	Sep. 29, 2018
Accounting Policies [Abstract]
Cash and Cash Equivalents	$ 23,115	$ 5,418
Restricted Cash and Investments, Current	1	26
Restricted Cash and Investments, Noncurrent	38	11
Cash, Cash Equivalents and Restricted Cash in the Statement of Cash Flows	$ 23,154	$ 5,455	$ 7,357	$ 4,155