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Employee Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2017
Retirement Benefits [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
| 2017 | 2016 |  | 2017 | 2016
Service Cost | $ | 8 |  | $ | 12 |  |  | $ | 28 |  | $ | 36 |
Interest Cost | 23 |  | 29 |  |  | 69 |  | 89 |
Expected Return on Plan Assets | (43 | ) | (39 | ) |  | (128 | ) | (118 | )
Amortization of Net Loss | 10 |  | 12 |  |  | 31 |  | 36 |
Net Periodic Benefit Cost | $ | (2 | ) | $ | 14 |  |  | $ | — |  | $ | 43 |
Special Termination Benefits - Management Workforce Reduction/Curtailment | — |  | — |  |  | 57 |  | — |
Total Expense | $ | (2 | ) | $ | 14 |  |  | $ | 57 |  | $ | 43 |
| Other Post-retirement Benefits
(Dollars in millions) | Third Quarters |  | Nine Months
| 2017 | 2016 |  | 2017 | 2016
Service Cost | $ | — |  | $ | — |  |  | $ | 1 |  | $ | 1 |
Interest Cost | 2 |  | 3 |  |  | 6 |  | 9 |
Amortization of Net Loss | — |  | 1 |  |  | — |  | 2 |
Net Periodic Benefit Cost | $ | 2 |  | $ | 4 |  |  | $ | 7 |  | $ | 12 |
Special Termination Benefits - Management Workforce Reduction/Curtailment | — |  | — |  |  | 13 |  | — |
Total Expense | $ | 2 |  | $ | 4 |  |  | $ | 20 |  | $ | 12 |

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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=82843861&loc=d3e1928-114920 + Details
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