Pension, Retiree Medical And Savings Plans (Weighted-Average Assumptions To Determine Projected Benefit Liability And Benefit Expense For Pension And Retiree Medical Plans) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 25, 2010	Dec. 26, 2009
U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability discount rate	4.60%	5.70%	6.10%
Expense discount rate	5.70%	6.00%	6.20%
Expected return on plan assets	7.80%	7.80%	7.80%
Liability rate of salary increases	3.70%	4.10%	4.40%
Expense rate of salary increases	4.10%	4.40%	4.40%
International [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability discount rate	4.80%	5.50%	5.90%
Expense discount rate	5.50%	6.00%	6.30%
Expected return on plan assets	6.70%	7.10%	7.10%
Liability rate of salary increases	4.10%	4.10%	4.10%
Expense rate of salary increases	4.10%	4.10%	4.20%
Retiree Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability discount rate	4.40%	5.20%	6.10%
Expense discount rate	5.20%	5.80%	6.20%
Expected return on plan assets	7.80%	7.80%