Basis of Presentation and Significant Accounting Policies Update Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 30, 2018	Oct. 01, 2018	Sep. 30, 2018	Dec. 24, 2017	Sep. 24, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained Earnings	$ 3,415	$ 1,382	$ 542		$ 30,067
Restricted cash and cash equivalents	0			$ 2,000
Accounting Standards Update 2016-01 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained Earnings	50
Reclassifications from accumulated other comprehensive income	50
Accounting Standards Update 2016-16 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained Earnings	$ 2,600
Other Noncurrent Assets [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash and cash equivalents				$ 2,000	$ 2,000