Income Taxes (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Operating Loss Carryforwards [Line Items]
Deferred Tax Liability Not Recognized, Cumulative Amount of Temporary Differences	$ 2,100
Reported in Consolidated Balance Sheets as:
Total Operating and Capital Loss Carryforwards	2,243
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	1,318	$ 1,261	$ 1,374
Foreign [Member]
Reported in Consolidated Balance Sheets as:
Total Operating and Capital Loss Carryforwards	487
State and Local Jurisdiction [Member]
Reported in Consolidated Balance Sheets as:
Total Operating and Capital Loss Carryforwards	1,012
Internal Revenue Service (IRS) [Member]
Reported in Consolidated Balance Sheets as:
Total Operating and Capital Loss Carryforwards	744
Continuing Operations [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	172	157
Deferred Tax Assets, Capital Loss Carryforwards	184	41
Net deferred tax assets (liabilities) [Abstract]
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	284	282
Employee benefits	185	152
Share-based compensation	100	121
Self-insured casualty claims	32	35
Lease related liabilities	65	69
Various liabilities	56	64
Deferred Tax Assets, Property, Plant and Equipment	37	33
Deferred income and other	32	51
Gross deferred tax assets	1,147	1,005
Deferred tax asset valuation allowances	(195)	(205)
Net deferred tax assets	952	800
Intangible assets, including goodwill	(107)	(111)
Property, plant and equipment	(46)	(46)
Other	(31)	(60)
Gross deferred tax liabilities	(184)	(217)
Net deferred tax assets (liabilities)	768	583
Reported in Consolidated Balance Sheets as:
Deferred Tax Assets, Net of Valuation Allowance, Current	774	591
Other liabilities and deferred credits	(6)	(8)
Net deferred tax assets (liabilities)	768	583
Income (Loss) from Continuing Operations before Income Taxes, Domestic	366	479	506
Income (Loss) from Continuing Operations before Income Taxes, Foreign	952	782	868
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	$ 1,318	$ 1,261	$ 1,374