Basis of Presentation and Significant Accounting Policies Update Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 29, 2019	Sep. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset	$ 479	$ 449
Operating Lease, Liability	529	500
Operating Lease, Liability, Current	136	127
Operating Lease, Liability, Noncurrent	393	373
Deferred Rent Credit		$ 51
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption on Income Statement and Cash Flows	$ 0