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Equity (Schedule of Share Repurchases) (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017
Class of Stock [Line Items] |  |  |
Dollars | $ 252 | $ 427 | $ 860
Class A [Member] |  |  |
Class of Stock [Line Items] |  |  |
Shares | 3.7 | 5.9 | 13.5
Dollars | $ 252 | $ 427 | $ 860
Share Repurchase Program [Member] | Class A [Member] |  |  |
Class of Stock [Line Items] |  |  |
Shares | 2.3 | 4.9 | 12.5
Dollars | $ 150 | $ 350 | $ 797
To fund certain obligations under equity compensation plans [Member] | Class A [Member] |  |  |
Class of Stock [Line Items] |  |  |
Shares | 1.4 | 1.0 | 1.0
Dollars | $ 102 | $ 77 | $ 63

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