Income Taxes, Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2017	Oct. 01, 2016	Sep. 26, 2015
Income Taxes [Abstract]
U.S. Federal income tax expense at the statutory rate	$ 157	$ 108	$ 43
Adjustments to Reconcile to the Income Tax Provision [Abstract]
U.S. state income tax expense	6	8	7
Changes in state valuation allowance	(9)	2	(7)
Research and development credits	(7)	(8)	(5)
Share-based compensation	(33)	(15)	0
Permanent differences	2	2	0
Changes in foreign valuation allowance	3	(1)	0
Foreign income taxed in the U.S.	0	7	0
Manufacturing tax benefits	(6)	0	0
Deduction of worthless investment	0	(9)	0
Permanent foreign currency differences	(1)	(8)	0
Rate differences between U.S. and foreign	(11)	(14)	(2)
Other	8	0	0
Expense for income taxes	$ 109	$ 72	$ 36

Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the foreign valuation allowance for deferred tax assets.

No definition available.