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Equity (Schedule of Share Repurchases) (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Oct. 01, 2016
Class of Stock [Line Items]      
Dollars $ 427 $ 860 $ 1,944
Class A [Member]      
Class of Stock [Line Items]      
Shares 5.9 13.5 32.1
Dollars $ 427 $ 860 $ 1,944
Share Repurchase Program [Member] | Class A [Member]      
Class of Stock [Line Items]      
Shares 4.9 12.5 30.8
Dollars $ 350 $ 797 $ 1,868
To fund certain obligations under equity compensation plans [Member] | Class A [Member]      
Class of Stock [Line Items]      
Shares 1.0 1.0 1.3
Dollars $ 77 $ 63 $ 76