Income Taxes - Net deferred tax assets and liabilities (Details) - USD ($) $ in Millions	Dec. 30, 2017	Dec. 31, 2016
Deferred tax assets
Obligation for pension and postretirement benefits	$ 247	$ 529
Accrued expenses	260	282
Deferred compensation	103	175
Loss carryforwards	214	158
Inventory	8	49
Allowance for credit losses	13	23
Other, net	32	67
Total deferred tax assets	877	1,283
Valuation allowance for deferred tax assets	(148)	(116)
Deferred tax assets	729	1,167
Deferred tax liabilities
Property, plant and equipment, principally depreciation	(125)	(168)
Amortization of goodwill and other intangibles	(154)	(164)
Leasing transactions	(81)	(147)
Prepaid pension benefits	(21)	(19)
Total deferred tax liabilities	(381)	(498)
Net deferred tax assets	348	$ 669
Deferred tax assets related to state loss carryforwards	46
Valuation allowance related to state loss carryforwards	$ 33