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Debt and Credit Agreements (Tables)
 3 Months Ended
Mar. 30, 2012
Debt Disclosure [Abstract]  
Activity related to long-term debt
Total activity related to long-term debt as of the end of first quarter 2012 was as follows:

(Dollars in millions)
Current Portion
Long-term Portion
Total
Long-term debt as of December 2011
$
507

$
8,734

$
9,241

2012 activity:
 
 
 
Long-term debt issued
—

300

300

Long-term debt repaid
(413
)
—

(413
)
Reclassifications
408

(408
)
—

Debt conversions to CSX stock
—

—

—

Discount and premium activity
—

(3
)
(3
)
Long-term debt as of the end of first quarter 2012
$
502

$
8,623

$
9,125