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Equity (Schedule of Share Repurchases) (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Class of Stock [Line Items]    
Payments for Repurchase of Common Stock $ 576 $ 387
Class A [Member]    
Class of Stock [Line Items]    
Treasury Stock, Shares, Acquired 9.0 8.3
Payments for Repurchase of Common Stock $ 576 $ 387
Share Repurchase Program [Member] | Class A [Member]    
Class of Stock [Line Items]    
Treasury Stock, Shares, Acquired 8.6 7.6
Payments for Repurchase of Common Stock $ 550 $ 357
Open Market Repurchases [Member] | Class A [Member]    
Class of Stock [Line Items]    
Treasury Stock, Shares, Acquired 0.4 0.7
Payments for Repurchase of Common Stock $ 26 $ 30