Stockholders' Equity, Share Repurchases (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
Sep. 26, 2020	Sep. 28, 2019	Sep. 29, 2018	Aug. 31, 2018
Stockholders' Equity [Abstract]
Authorized amount of share repurchase program				$ 500
Number of shares repurchased and retired (in shares)		1,512
Shares repurchased and retired	$ 0	$ 72	$ 35
Average price of shares repurchased (in dollars per share)		$ 47.64
Common stock, par value (in dollars per share)		$ 0.01

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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