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Equity (Schedule of Share Repurchases) (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Class of Stock [Line Items]    
Payments for Repurchase of Common Stock $ 83 $ 164
Class A [Member]    
Class of Stock [Line Items]    
Treasury Stock, Shares, Acquired 1.4 2.1
Payments for Repurchase of Common Stock $ 83 $ 164
Under share repurchase program | Class A [Member]    
Class of Stock [Line Items]    
Treasury Stock, Shares, Acquired 0.9 1.5
Payments for Repurchase of Common Stock $ 50 $ 120
To fund certain obligations under equity compensation plans | Class A [Member]    
Class of Stock [Line Items]    
Treasury Stock, Shares, Acquired 0.5 0.6
Payments for Repurchase of Common Stock $ 33 $ 44