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Equity Equity (Schedule of Share Repurchases) (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Apr. 01, 2017 | Mar. 31, 2018 | Apr. 01, 2017
Class of Stock [Line Items] |  |  |  |
Payments for Repurchase of Common Stock |  |  | $ 237 | $ 733
Class A [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Treasury Stock, Shares, Acquired | 1.0 | 2.8 | 3.1 | 11.8
Payments for Repurchase of Common Stock | $ 73 | $ 182 | $ 237 | $ 758
Under share repurchase program | Class A [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Treasury Stock, Shares, Acquired | 0.8 | 2.6 | 2.3 | 11.2
Payments for Repurchase of Common Stock | $ 60 | $ 167 | $ 180 | $ 717
To fund certain obligations under equity compensation plans | Class A [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Treasury Stock, Shares, Acquired | 0.2 | 0.2 | 0.8 | 0.6
Payments for Repurchase of Common Stock | $ 13 | $ 15 | $ 57 | $ 41

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