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Equity (Schedule of Share Repurchases) (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
Class of Stock [Line Items]        
Payments for Repurchase of Common Stock     $ 225 $ 367
Class A [Member]        
Class of Stock [Line Items]        
Treasury Stock, Shares, Acquired 1.0 1.9 3.4 5.0
Payments for Repurchase of Common Stock $ 79 $ 130 $ 225 $ 367
Under share repurchase program | Class A [Member]        
Class of Stock [Line Items]        
Treasury Stock, Shares, Acquired 0.6 1.8 2.3 4.1
Payments for Repurchase of Common Stock $ 50 $ 120 $ 150 $ 300
To fund certain obligations under equity compensation plans | Class A [Member]        
Class of Stock [Line Items]        
Treasury Stock, Shares, Acquired 0.4 0.1 1.1 0.9
Payments for Repurchase of Common Stock $ 29 $ 10 $ 75 $ 67