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Debt and Credit Agreements (Tables)
 3 Months Ended
Mar. 25, 2016
Debt Disclosure [Abstract]  
Activity Related to Long-Term Debt
Total activity related to long-term debt as of the end of first 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:
 
 
 
Discount and premium activity
—

(1
)
(1
)
Debt issue cost activity
—

2

2

Long-term debt as of March 2016
$
20

$
10,516

$
10,536

(a) Long-term debt as of December 2015 - debt issue costs of $168 million 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.