Employee Benefit Plans (Net Benefit Expense) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 26, 2014		Dec. 27, 2013		Dec. 28, 2012
Pension Benefits [Member]
Components of expense/ (income) related to net benefit expense [Abstract]
Service Cost	$ 44		$ 49		$ 44
Interest Cost	123		108		123
Expected Return on Plan Assets	(166)		(162)		(166)
Amortization of Net Loss	57	[1]	100	[1]	82
Amortization of Prior Service Cost	0	[2]	0	[2]	0
Net Periodic Benefit Expense	58		95		83
defined benefit, special termination benefits/curtailments	27	[3]	0	[3]	0	[3]
Settlement gain	(1)		(2)		(2)	[4]
Total Expense	84		93		81
Post-retirement Benefits [Member]
Components of expense/ (income) related to net benefit expense [Abstract]
Service Cost	3		3		4
Interest Cost	13		13		16
Expected Return on Plan Assets	0		0		0
Amortization of Net Loss	5	[1]	14	[1]	9
Amortization of Prior Service Cost	(1)	[2]	(1)	[2]	(1)
Net Periodic Benefit Expense	20		29		28
defined benefit, special termination benefits/curtailments	8	[3]	0	[3]	0	[3]
Settlement gain	0		0		0	[4]
Total Expense	$ 28		$ 29		$ 28

[1] Amortization of net losses estimated to be expensed for 2015 is approximately $70 million and $5 million for pension benefits and post-retirement benefits, respectively. The increase in amortization is largely related to the impact of lower discount rates and adoption of new mortality tables, partially offset by favorable pension asset experience.

[2] Amortization of prior service costs estimated to be expensed in 2015 is less than $1 million for pension benefits. The estimated post-retirement benefits amount to be credited to expense for 2015 is $1 million.

[3] These charges result from a management workforce reduction program that was initiated in 2014. For further information regarding the program, see Note 1. Nature of Operations and Significant Accounting Policies.

[4] 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.