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Debt and Credit Agreements (Tables)
 6 Months Ended
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.