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Employee Benefit Plans (Tables) | 9 Months Ended
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Sep. 23, 2016
Compensation and Retirement Disclosure [Abstract] |
Components of Expense/(Income) Related to Net Benefit Expense | The following table describes the components of expense / (income) related to net benefit expense recorded in labor and fringe on the income statement.
| Pension Benefits
(Dollars in millions) | Third Quarters |  | Nine Months
| 2016 | 2015 |  | 2016 | 2015
Service Cost | $ | 12 |  | $ | 12 |  |  | $ | 36 |  | $ | 34 |
Interest Cost | 29 |  | 29 |  |  | 89 |  | 87 |
Expected Return on Plan Assets | (39 | ) | (41 | ) |  | (118 | ) | (122 | )
Amortization of Net Loss | 12 |  | 17 |  |  | 36 |  | 52 |
Net Periodic Benefit Cost | 14 |  | 17 |  |  | 43 |  | 51 |
Special Termination Benefits – Workforce Reduction Program(a) | — |  | — |  |  | — |  | 7 |
Total Expense | $ | 14 |  | $ | 17 |  |  | $ | 43 |  | $ | 58 |
| Other Post-retirement Benefits
(Dollars in millions) | Third Quarters |  | Nine Months
| 2016 | 2015 |  | 2016 | 2015
Service Cost | $ | — |  | $ | 2 |  |  | $ | 1 |  | $ | 3 |
Interest Cost | 3 |  | 3 |  |  | 9 |  | 10 |
Amortization of Net Loss | 1 |  | 1 |  |  | 2 |  | 3 |
Amortization of Prior Service Costs | — |  | (1 | ) |  | — |  | (1 | )
Total Expense | $ | 4 |  | $ | 5 |  |  | $ | 12 |  | $ | 15 |
(a) Special termination benefits were charges in 2015 that resulted from a management workforce reduction program initiated in 2014.

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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