Employee Benefit Plans - Schedule of Allocation of Plan Assets (Details) - USD ($) $ in Millions	Dec. 30, 2016	Dec. 25, 2015
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 2,539	$ 2,309
Percent of Total Assets	100.00%	100.00%
Equity
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 1,806	$ 1,626
Percent of Total Assets	71.00%	70.00%
Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 665	$ 641
Percent of Total Assets	26.00%	28.00%
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 68	$ 42
Percent of Total Assets	3.00%	2.00%