Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 25, 2015	Sep. 26, 2014
Current income tax expense (benefit):
U.S: Federal	$ (1,115)	$ (67)	$ 128
U.S: State	(163)	12	(3)
Non-U.S	321	352	302
Current income tax expense (benefit)	(957)	297	427
Deferred income tax expense (benefit):
U.S: Federal	173	87	(311)
U.S: State	20	5	(3)
Non-U.S	(15)	(52)	33
Deferred income tax expense (benefit)	178	40	(281)
Income tax expense (benefit)	$ (779)	$ 337	$ 146