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Equity (Schedule of Share Repurchases) (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Mar. 30, 2019
Mar. 31, 2018
Class of Stock [Line Items]        
Payments for Repurchase of Common Stock     $ 146 $ 237
Class A [Member]        
Class of Stock [Line Items]        
Treasury Stock, Shares, Acquired 1.0 1.0 2.4 3.1
Payments for Repurchase of Common Stock $ 63 $ 73 $ 146 $ 237
Under share repurchase program | Class A [Member]        
Class of Stock [Line Items]        
Treasury Stock, Shares, Acquired 0.8 0.8 1.7 2.3
Payments for Repurchase of Common Stock $ 50 $ 60 $ 100 $ 180
To fund certain obligations under equity compensation plans | Class A [Member]        
Class of Stock [Line Items]        
Treasury Stock, Shares, Acquired 0.2 0.2 0.7 0.8
Payments for Repurchase of Common Stock $ 13 $ 13 $ 46 $ 57