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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