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Debt and Credit Agreements (Tables) | 6 Months Ended
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Jun. 24, 2016
Debt Disclosure [Abstract] |
Activity Related to Long-Term Debt | Total activity related to long-term debt as of the end of second quarter 2016 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 2015 (a) | $ | 20 |  | $ | 10,515 |  | $ | 10,535 |
2016 activity: |  |  |
Reclassifications | 612 |  | (612 | ) | — |
Discount and premium activity | — |  | (2 | ) | (2 | )
Debt issue cost activity | — |  | 4 |  | 4 |
Long-term debt as of second quarter 2016 | $ | 632 |  | $ | 9,905 |  | $ | 10,537 |
(a) Long-term debt as of December 2015 includes debt issue costs of $168 million that were reclassed from long-term assets to long-term debt on the consolidated balance sheet as a result of ASU, Interest - Imputation of Interest, which became effective for CSX during first quarter 2016.

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