Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Income Tax Contingency [Line Items]
Federal Statutory Tax Rate, Pre TCJ Act	35.00%
Federal Statutory Tax Rate, Post TCJ Act	0.00%
Provisional net tax expense related to the TCJ Act	$ 2,451	$ 0	$ 0
Total gross amount of reserves for income taxes	2,200
Interest accrued	283	193
Interest accrued recognized	89	$ 61
Operating loss carryforwards	12,600
Income tax undistributed international earnings	42,500
Mandatory OneTime Repatriation TCJ ACT	4,000
Remeasurement of Deferred Taxes TCJ Act	1,500
Foreign Earnings Repatriated	$ 20,000
Effective Income Tax Rate Reconciliation, Percent	48.90%	25.40%	26.10%
undistributed earnings of foreign subsidiaries, post distribution	$ 22,500
Expire in 2016
Income Tax Contingency [Line Items]
Operating loss carryforwards	200
Expire Between 2017 and 2035 Years
Income Tax Contingency [Line Items]
Operating loss carryforwards	11,100
Carried Forward Indefinitely
Income Tax Contingency [Line Items]
Operating loss carryforwards	$ 1,300