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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

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