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Employee Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2018
Retirement Benefits [Abstract] |
Components of Expense/(Income) Related to Net Benefit Expense |
| Pension Benefits
(Dollars in millions) | Second Quarters |  | Six Months
| 2018 | 2017 |  | 2018 | 2017
Service Cost Included in Labor and Fringe | $ | 7 |  | $ | 9 |  |  | $ | 16 |  | $ | 20 |
Interest Cost | 23 |  | 23 |  |  | 46 |  | 46 |
Expected Return on Plan Assets | (43 | ) | (43 | ) |  | (87 | ) | (85 | )
Amortization of Net Loss | 10 |  | 10 |  |  | 20 |  | 21 |
Total Income Included in Other Income - Net | (10 | ) | (10 | ) |  | (21 | ) | (18 | )
Net Periodic Benefit Cost | $ | (3 | ) | $ | (1 | ) |  | $ | (5 | ) | $ | 2 |
Restructuring Charges - Non Operating (a) | — |  | 7 |  |  | — |  | 57 |
Total (Income) Expense | $ | (3 | ) | $ | 6 |  |  | $ | (5 | ) | $ | 59 |
| Other Post-retirement Benefits
(Dollars in millions) | Second Quarters |  | Six Months
| 2018 | 2017 |  | 2018 | 2017
Service Cost Included in Labor and Fringe | $ | 1 |  | $ | 1 |  |  | $ | 1 |  | $ | 1 |
Interest Cost | 1 |  | 2 |  |  | 3 |  | 4 |
Total Expense Included in Other Income - Net | 1 |  | 2 |  |  | 3 |  | 4 |
Net Periodic Benefit Cost | $ | 2 |  | $ | 3 |  |  | $ | 4 |  | $ | 5 |
Restructuring Charges - Non Operating (a) | — |  | — |  |  | — |  | 13 |
Total Expense | $ | 2 |  | $ | 3 |  |  | $ | 4 |  | $ | 18 |
(a) Charges related to special termination benefits and curtailment costs were the result of the management workforce reductions in first quarter 2017. See Management Workforce Reductions in Note 1. Nature of Operations and Significant Accounting Policies.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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