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Equity (Schedule of Share Repurchases) (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Class of Stock [Line Items]    
Payments for Repurchase of Common Stock $ 132 $ 83
Class A [Member]    
Class of Stock [Line Items]    
Treasury Stock, Shares, Acquired 1.5 1.4
Payments for Repurchase of Common Stock $ 132 $ 83
Under share repurchase program | Class A [Member]    
Class of Stock [Line Items]    
Treasury Stock, Shares, Acquired 1.1 0.9
Payments for Repurchase of Common Stock $ 100 $ 50
To fund certain obligations under equity compensation plans | Class A [Member]    
Class of Stock [Line Items]    
Treasury Stock, Shares, Acquired 0.4 0.5
Payments for Repurchase of Common Stock $ 32 $ 33