Employee Benefit Plans (Pension and Other Post-Employment Benefits Adjustments) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 30, 2011		Dec. 31, 2010		Dec. 25, 2009
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 (Gains)	191		48
Prior service credits	0		(9)
Expense (Income) recognized in income statement [Abstract]
Amortization of net losses	71	[1]	58	[1]
Settlement gain	(2)	[2]	(2)	[2]	0	[2]
Amortization of prior service costs (credits)	0	[3]	0	[3]
Estimated amount to be expensed in the future period	82
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Losses	1,169
Prior service credits	1
Total	1,170
Other Postretirement Benefit Plans, Defined Benefit [Member]
Components of other comprehensive loss (income) [Abstract]
Losses (Gains)	25		(9)
Prior service credits	0		(6)
Expense (Income) recognized in income statement [Abstract]
Amortization of net losses	7	[1]	7	[1]
Settlement gain	0	[2]	0	[2]	0	[2]
Amortization of prior service costs (credits)	(1)	[3]	0	[3]
Estimated amount to be expensed in the future period	9
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	102
Prior service credits	(5)
Total	$ 97

[1] The estimated amount to be expensed for 2012 is $82 million and $9 million for pension benefits and post-retirement benefits, respectively. The increase in the pension expense is largely related to additional amortization of the losses incurred by the pension plan assets during 2011.

[2] In 2011 and 2010, in one of the company's pension plans, the lump-sum payments exceeded the sum of the service cost and interest cost recognized. As such, the company was required to recognize a portion of its accumulated other comprehensive income related to that plan into earnings.

[3] Remaining prior service costs to be expensed in 2012 are less than $1 million. The estimated post-retirement benefits amount to be credited to expense for 2012 is $1 million.