Income Taxes - Reconciliation of (Benefit) Provision for Income Taxes from Continuing Operations (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal income taxes computed at statutory rate									$ 104	$ 141	$ 46
State income taxes, net of federal income tax benefit									20	16	2
Stock-based compensation									(6)	(26)	(3)
Non-deductible expenses									3	5	5
Change in the valuation allowance for deferred tax assets									1	(1)	(128)
Net operating loss expirations									3	1	2
Tax credits									(6)	(3)	(3)
Change in unrecognized tax benefits									(21)	(1)	1
Change in U.S. federal statutory tax rate									(8)	(173)	0
Other									(1)	1	(1)
Total income tax provision (benefit)	$ 32	$ 26	$ 35	$ (4)	$ (119)	$ 51	$ 20	$ 8	$ 89	$ (40)	$ (79)