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. 29, 2012	Dec. 31, 2011	Dec. 25, 2010
U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability discount rate	4.20%	4.60%	5.70%
Expense discount rate	4.60%	5.70%	6.00%
Expected return on plan assets	7.80%	7.80%	7.80%
Liability rate of salary increases	3.70%	3.70%	4.10%
Expense rate of salary increases	3.70%	4.10%	4.40%
International [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability discount rate	4.40%	4.80%	5.50%
Expense discount rate	4.80%	5.50%	6.00%
Expected return on plan assets	6.70%	6.70%	7.10%
Liability rate of salary increases	3.90%	4.10%	4.10%
Expense rate of salary increases	4.10%	4.10%	4.10%
Retiree Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability discount rate	3.70%	4.40%	5.20%
Expense discount rate	4.40%	5.20%	5.80%
Expected return on plan assets	7.80%	7.80%	7.80%