Income Taxes, Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Income Taxes [Abstract]
U.S. Federal income tax expense at the statutory rate	$ 103	$ 117	$ 157
Adjustments to Reconcile to the Income Tax Provision [Abstract]
U.S. state income tax expense	9	12	6
Changes in state valuation allowance	0	0	(9)
Research and development credits	(8)	(7)	(7)
Share-based compensation	(12)	(8)	(33)
U.S. tax reform	0	(124)	0
Permanent differences	0	0	2
Changes in foreign valuation allowance	13	(10)	3
Foreign income taxed in the U.S.	3	0	0
Manufacturing tax benefits	0	(6)	(6)
Permanent foreign currency differences	0	0	(1)
Rate differences between U.S. and foreign	7	3	(11)
Sale of subsidiary	(38)	0	0
Other	9	4	8
Expense for income taxes	$ 86	$ (19)	$ 109

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.