Income Taxes - Recon between U.S. Federal Taxes and Statutory Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 25, 2015	Sep. 26, 2014
Reconciliation between U.S. federal income taxes at the statutory rate and income tax expense (benefit) on continuing operations
Notional U.S. federal income tax expense at the statutory rate	$ 407	$ 551	$ 616
U.S. state income tax expense (benefit), net	(93)	11	(4)
Other (income) expense-Tax Sharing Agreement	221	18	(23)
Tax law changes	(3)	10	(1)
Tax credits	(10)	(9)	(8)
Non-U.S. net earnings	(342)	(275)	(287)
Nondeductible charges	2	2	3
Change in accrued income tax liabilities	(1,056)	(183)	112
Valuation allowance	97	(3)	(239)
Legal entity restructuring	39	211
Divestitures	(31)
Other	(10)	4	(23)
Income tax expense (benefit)	$ (779)	$ 337	$ 146