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Pension, Retiree Medical and Savings Plans (Weighted-Average Assumptions to Determine Projected Benefit Liability and Benefit Expense for Pension and Retiree Medical Plans) (Details)
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12 Months Ended | ||
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Dec. 29, 2012
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Dec. 31, 2011
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Dec. 25, 2010
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U.S. [Member]
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| 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% |
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International [Member]
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| 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% |
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Retiree Medical Plan [Member]
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| 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% |