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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Dec. 30, 2017 | Jul. 01, 2017 | Sep. 29, 2018 | Jun. 30, 2018 | Jul. 01, 2017 | Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017
Federal Statutory Income Tax Rates [Line Items] |  |  |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 35.00% |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Percent |  |  |  |  |  | 1.30% |  |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability | $ (1) | $ (9) | $ (994) |  |  | $ (1,004) |  |  |  |
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Percent |  |  |  |  |  | 50.50% |  |  |  |
Effective tax rate for continuing operations | 25.00% |  |  | 27.40% |  | (25.30%) | 32.50% |  |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent |  |  |  | 2.90% |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Disposition of Business, Amount |  |  |  | 4.20% |  |  |  |  |  |
Unrecognized tax benefits | $ 311 |  |  |  |  | $ 311 |  |  |  | $ 316
Decrease in Unrecognized Tax Benefits is Reasonably Possible | $ 16 |  |  |  |  | $ 16 |  |  |  |
Undistributed Earnings of Foreign Subsidiaries |  |  |  |  |  |  |  |  |  | $ 182
Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |
Federal Statutory Income Tax Rates [Line Items] |  |  |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  | 21.00% |  |  | 21.00% | 24.50% |

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