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Equity Equity (Schedule of Share Repurchases) (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Class of Stock [Line Items]    
Payments for Repurchase of Common Stock $ 164 $ 576
Class A [Member]    
Class of Stock [Line Items]    
Treasury Stock, Shares, Acquired 2.1 9.0
Payments for Repurchase of Common Stock $ 164 $ 576
Under share repurchase program | Class A [Member]    
Class of Stock [Line Items]    
Treasury Stock, Shares, Acquired 1.5 8.6
Payments for Repurchase of Common Stock $ 120 $ 550
To fund certain obligations under equity compensation plans | Class A [Member]    
Class of Stock [Line Items]    
Treasury Stock, Shares, Acquired 0.6 0.4
Payments for Repurchase of Common Stock $ 44 $ 26