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Debt and Credit Agreements (Tables) | 3 Months Ended
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Mar. 31, 2019
Debt Disclosure [Abstract] |
Schedule of Activity Related to Long-Term Debt | Total activity related to long-term debt as of the end of first quarter 2019 is shown in the table below. For fair value information related to the Company's long-term debt, see Note 11, Fair Value Measurements.
(Dollars in millions) | Current Portion | Long-term Portion | Total
Long-term debt as of December 31, 2018 | $ | 18 |  | $ | 14,739 |  | $ | 14,757 |
2019 activity: |  |  |
Long-term debt issued | — |  | 1,000 |  | 1,000 |
Discount, premium and other activity | — |  | 9 |  | 9 |
Long-term debt as of March 31, 2019 | $ | 18 |  | $ | 15,748 |  | $ | 15,766 |

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