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Stock Plans and Share-Based Compensation - Restricted Stock Grant and Vesting Information (Details) - Restricted Stock - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average grant date fair value (in dollars per share) $ 62.60 $ 48.35 $ 24.21
Fair value of units vested in fiscal year ending (in millions) $ 9 $ 8 $ 14