Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015
Income Tax Contingency [Line Items]
Total gross amount of reserves for income taxes	$ 1,885
Interest accrued	193	$ 144
Interest accrued recognized	61	$ 14
Operating loss carryforwards	11,300
Income tax undistributed international earnings	44,900
Expire in 2016
Income Tax Contingency [Line Items]
Operating loss carryforwards	100
Expire Between 2017 and 2035 Years
Income Tax Contingency [Line Items]
Operating loss carryforwards	9,900
Carried Forward Indefinitely
Income Tax Contingency [Line Items]
Operating loss carryforwards	$ 1,300