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Debt and Credit Agreements (Tables) | 6 Months Ended
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Jun. 30, 2018
Debt Disclosure [Abstract] |
Activity Related to Long-Term Debt | Total activity related to long-term debt as of the end of second quarter 2018 is shown in the table below. For fair value information related to the Company's long-term debt, see Note 9, Fair Value Measurements.
(Dollars in millions) | Current Portion | Long-term Portion | Total
Long-term debt as of December 31, 2017 | $ | 19 |  | $ | 11,790 |  | $ | 11,809 |
2018 activity: |  |  |
Long-term debt issued | — |  | 2,000 |  | 2,000 |
Discount, premium and other activity |  | (21 | ) | (21 | )
Long-term debt as of June 30, 2018 | $ | 19 |  | $ | 13,769 |  | $ | 13,788 |

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