Employee Benefit Plans - Schedule of Pre-tax Change in Other Comprehensive Loss (Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2016	Dec. 25, 2015	Dec. 26, 2014
Pension Plans
Components of other comprehensive loss (income) [Abstract]
Losses (Gains)	$ 38	$ 60
Expense (Income) recognized in income statement [Abstract]
Amortization of net losses	48	70	$ 57
Settlement gain	(1)	(2)	(1)
Amortization of prior service costs	0	0	0
Estimated amount to be expensed in the future period	43
Post-retirement Medical Plan
Components of other comprehensive loss (income) [Abstract]
Losses (Gains)	(22)	(7)
Expense (Income) recognized in income statement [Abstract]
Amortization of net losses	3	4	5
Settlement gain	0	0	0
Amortization of prior service costs	$ 0	$ (1)	$ (1)