Employee Benefit Plans (Pension and Other Post-Employment Benefits Adjustments) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 27, 2013		Dec. 28, 2012		Dec. 30, 2011
Pension Plan, Defined Benefit [Member]
Components of other comprehensive loss (income) [Abstract]
(Gains) Losses	$ (462)		$ 130
Prior service credits	0		0
Expense (Income) recognized in income statement [Abstract]
Amortization of net losses	100	[1]	82	[1]	71
Settlement gain	(2)	[2]	(2)	[2]	(2)	[2]
Amortization of prior service cost	0	[3]	0	[3]	0
Estimated amount to be expensed in the future period	57
Remaining prior service costs to be expensed in future period	1
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Losses	658
Prior Service Costs (Credits)	1
Total	659
Other Postretirement Benefit Plan, Defined Benefit [Member]
Components of other comprehensive loss (income) [Abstract]
(Gains) Losses	(48)		43
Prior service credits	0		(1)
Expense (Income) recognized in income statement [Abstract]
Amortization of net losses	14	[1]	9	[1]	7
Settlement gain	0	[2]	0	[2]	0	[2]
Amortization of prior service cost	(1)	[3]	(1)	[3]	(1)
Estimated amount to be expensed in the future period	6
Remaining prior service costs to be expensed in future period	1
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Losses	73
Prior Service Costs (Credits)	(3)
Total	$ 70

[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] 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.

[3] 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.