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Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Oct. 01, 2017 | Oct. 02, 2016 | Nov. 01, 2018
Accelerated Share Repurchases [Line Items] |  |  |  |
Authorized shares of common stock | 2,400,000,000 | 2,400,000,000 |  |
Common stock, par value | $ 0.001 | $ 0.001 |  |
Authorized shares of preferred stock | 7,500,000 |  |  |
Outstanding shares of preferred stock | 0 |  |  |
Shares of common stock repurchased | 131,500,000 | 37,500,000 | 34,900,000 |
Total cost of common stock repurchased | $ 7,200.0 | $ 2,100.0 | $ 2,000.0 |
Shares available for repurchase | 48,800,000 |  |  |
Subsequent Event [Member] |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  | 120,000,000

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