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Debt (Table) | 12 Months Ended
--- | ---
Dec. 31, 2018
Debt Disclosure [Abstract] |
Revolving credit facilities | The following table summarizes the revolving credit agreement as of December 31, 2018:
(Dollars in millions) |
Maximum borrowing capacity | $ | 300 |
Letters of credit outstanding | $ | 2 |
Amount borrowed | $ | — |
Amount available for use | $ | 298 |
Financial covenants | The revolving credit agreement includes the following financial covenants:
▪ | Consolidated Interest Coverage Ratio may not be less than 3.00 to 1.00 as of the end of any fiscal quarter.
▪ | Consolidated Leverage Ratio may not be greater than the ratios indicated as of the end of any fiscal quarter for each period specified below:
| Period | Ratios |
| From the agreement date of May 10, 2018 through June 30, 2019 | 3.25 to 1.00 |
| From July 1, 2019 and thereafter | 3.00 to 1.00 |
Long-term debt | Long-term debt as of December 31, 2018 and 2017, was as follows:
|  |  |  | December 31, 2018 |  | December 31, 2017
| Issuance date | Maturity date | Call date (any time on or after) | Principal Amount |  | Less Unamortized discount and debt issuance costs |  | Total |  | Principal Amount |  | Less Unamortized discount and debt issuance costs |  | Total
(Dollars in millions) |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
6.700% | Dec 2003 and June 2004 | Dec 2033 | Dec 2003 and June 2004 | $ | 544 |  |  | $ | 14 |  |  | $ | 530 |  |  | $ | 544 |  |  | $ | 15 |  |  | $ | 529 |
6.950% | May 2011 | May 2060 | May 2016 | 342 |  |  | 11 |  |  | 331 |  |  | 342 |  |  | 11 |  |  | 331 |
7.250% | Dec 2014 | Dec 2063 | Dec 2019 | 275 |  |  | 10 |  |  | 265 |  |  | 275 |  |  | 10 |  |  | 265 |
7.250% | Nov 2015 | Dec 2064 | Dec 2020 | 300 |  |  | 10 |  |  | 290 |  |  | 300 |  |  | 10 |  |  | 290 |
Term Loan | Jul 2015 | Jan 2022 |  | 191 |  |  | 1 |  |  | 190 |  |  | 203 |  |  | 2 |  |  | 201 |
Capital lease obligations |  | 5 |  |  | — |  |  | 5 |  |  | 4 |  |  | — |  |  | 4 |
Installment payment agreement |  | 14 |  |  | 1 |  |  | 13 |  |  | 21 |  |  | 1 |  |  | 20 |
Total long-term debt |  | $ | 1,671 |  |  | $ | 47 |  |  | $ | 1,624 |  |  | $ | 1,689 |  |  | $ | 49 |  |  | $ | 1,640 |
Long-term debt, current |  |  |  |  |  | $ | 19 |  |  |  |  |  |  | $ | 18 |
Long-term debt, noncurrent |  |  |  |  |  | $ | 1,605 |  |  |  |  |  |  | $ | 1,622 |

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