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Summary of Significant Accounting Policies Update - ASU 2014-09 (Details) - USD ($) $ in Millions | Sep. 29, 2018 | Dec. 31, 2017 | Dec. 30, 2017
--- | --- | --- | ---
New Accounting Standards |  |  |
Retained earnings | $ 6,419 |  | $ 5,368
ASC 606 | Effect of adoption of ASC 606 |  |  |
New Accounting Standards |  |  |
Retained earnings | $ (125) | $ 90 |

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