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Equity Equity (Schedule of Share Repurchases) (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended
--- | ---
Dec. 30, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |
Payments for Repurchase of Common Stock | $ 164 | $ 576
Class A [Member] |  |
Class of Stock [Line Items] |  |
Treasury Stock, Shares, Acquired | 2.1 | 9.0
Payments for Repurchase of Common Stock | $ 164 | $ 576
Under share repurchase program | Class A [Member] |  |
Class of Stock [Line Items] |  |
Treasury Stock, Shares, Acquired | 1.5 | 8.6
Payments for Repurchase of Common Stock | $ 120 | $ 550
To fund certain obligations under equity compensation plans | Class A [Member] |  |
Class of Stock [Line Items] |  |
Treasury Stock, Shares, Acquired | 0.6 | 0.4
Payments for Repurchase of Common Stock | $ 44 | $ 26

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