Note 14 Stockholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 28, 2019	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018	Mar. 11, 2019	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance		8,000,000.0
Stock options and unvested restricted stock units outstanding		3,600,000
Number of Shares Available for Future Grant		4,400,000
Stock Repurchase Program Additional Authorized Amount	$ 200
Stock Repurchase Program, Authorized Amount						$ 200
Stock Repurchased During Period, Shares		6,400,000	300,000	5,000,000.0
Stock Repurchased During Period, Value		$ 166	$ 7	$ 146
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 135
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation		398,000	207,000	334,000
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation		$ 13	$ 6	$ 12
2019 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance					4,000,000
Stock Plan Expiration Date		December 2028