Employee Benefit Plans (Pension and Other Post-Employment Benefits Adjustments) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 28, 2012		Dec. 30, 2011		Dec. 31, 2010
Maximum [Member]
Expense (Income) recognized in income statement [Abstract]
Remaining prior service costs to be expensed in future period	$ 1
Pension Plans, Defined Benefit [Member]
Components of other comprehensive loss (income) [Abstract]
Losses	130		191
Prior service credits	0		0
Expense (Income) recognized in income statement [Abstract]
Amortization of net losses	82		71		58
Settlement gain	(2)	[1]	(2)	[1]	(2)	[1]
Amortization of prior service cost	0	[2]	0	[2]	0
Estimated amount to be expensed in the future period	101
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Losses	1,218
Prior Service Costs (Credits)	1
Total	1,219
Other Postretirement Benefit Plans, Defined Benefit [Member]
Components of other comprehensive loss (income) [Abstract]
Losses	43		25
Prior service credits	(1)		0
Expense (Income) recognized in income statement [Abstract]
Amortization of net losses	9		7		7
Settlement gain	0	[1]	0	[1]	0	[1]
Amortization of prior service cost	(1)	[2]	(1)	[2]	0
Estimated amount to be expensed in the future period	14
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	135
Prior Service Costs (Credits)	(4)
Total	$ 131

[1] 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.

[2] Amortization of prior service costs estimated to be expensed in 2013 are less than $1 million for pension benefits. The estimated post-retirement benefits amount to be credited to expense for 2013 is $1 million.