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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

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