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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 30, 2017 | Dec. 31, 2016 | Sep. 29, 2018 | 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% |  |  |  |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  | $ 994 |  |  |  |  |
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Percent |  | (118.10%) |  |  |  |  |
Effective tax rate for continuing operations |  | (93.80%) | 34.90% |  |  |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent |  | 2.30% |  |  |  |  |
Unrecognized tax benefits |  | $ 305 |  |  |  |  | $ 316
Decrease in Unrecognized Tax Benefits is Reasonably Possible |  | 12 |  |  |  |  |
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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