Comprehensive Income - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 29, 2018
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Loss	$ 1	$ 1
Accumulated Other Comprehensive Income/(Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Loss	(82)	(83)
Foreign currency translation loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Loss	(82)	(83)
Total accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Loss	$ (81)	$ (82)