Income Taxes - Significant Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 29, 2018	Dec. 30, 2017
Deferred tax assets:
Allowance for doubtful accounts	$ 8	$ 7
Accrued employee benefits	13	7
Restructuring reserves	3	5
Workers’ compensation, general and fleet liabilities	40	43
Deferred financing costs	2	2
Postretirement benefit obligations	9	23
Net operating loss carryforwards	73	86
Other accrued expenses	13	10
Total gross deferred tax assets	161	183
Less valuation allowance	(30)	(29)
Total net deferred tax assets	131	154
Deferred tax liabilities:
Property and equipment	(121)	(92)
Inventories	(39)	(30)
Intangibles	(262)	(274)
Total deferred tax liabilities	(422)	(396)
Net deferred tax liability	$ (291)	$ (242)