Employee Benefit Plans (Net Benefit Expense) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 27, 2013		Dec. 28, 2012		Dec. 30, 2011
Pension Plans, Defined Benefit [Member]
Components of expense/ (income) related to net benefit expense [Abstract]
Service Cost	$ 49		$ 44		$ 40
Interest Cost	108		123		121
Expected Return on Plan Assets	(162)		(166)		(157)
Amortization of Net Loss	100	[1]	82	[1]	71
Amortization of Prior Service Cost	0	[2]	0	[2]	0
Net Periodic Benefit Expense	95		83		75
Settlement gain	(2)	[3]	(2)	[3]	(2)	[3]
Total Expense	93		81		73
Other Post-Retirement Benefits
Components of expense/ (income) related to net benefit expense [Abstract]
Service Cost	3		4		2
Interest Cost	13		16		11
Expected Return on Plan Assets	0		0		0
Amortization of Net Loss	14	[1]	9	[1]	7
Amortization of Prior Service Cost	(1)	[2]	(1)	[2]	(1)
Net Periodic Benefit Expense	29		28		19
Settlement gain	0	[3]	0	[3]	0	[3]
Total Expense	$ 29		$ 28		$ 19

[1] Amortization of net losses estimated to be expensed for 2014 is $57 million and $6 million for pension benefits and post-retirement benefits, respectively. The decrease in amortization is largely related to the impact of increasing discount rates.

[2] Amortization of prior service costs estimated to be expensed in 2014 are less than $1 million for pension benefits. The estimated post-retirement benefits amount to be credited to expense for 2014 is $1 million.

[3] Settlement gains were recognized as one of the pension plan's lump-sum payments exceeded the sum of the service cost and interest cost recognized. The gain is the recognition of a portion of its accumulated other comprehensive income related to that plan.