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Nature of Operations and Significant Accounting Policies (Policies)
9 Months Ended
Sep. 27, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Basis of Accounting, Policy [Policy Text Block]
Basis of Presentation

In the opinion of management, the accompanying consolidated financial statements contain all normal, recurring adjustments necessary to fairly present the following:
  
Consolidated income statements for the quarters and nine months ended September 27, 2013 and September 28, 2012;
Consolidated comprehensive income statements for the quarters and nine months ended September 27, 2013 and September 28, 2012;
Consolidated balance sheets at September 27, 2013 and December 28, 2012; and
Consolidated cash flow statements for the nine months ended September 27, 2013 and September 28, 2012.

NOTE 1.
Nature of Operations and Significant Accounting Policies, continued

Pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”), certain information and disclosures normally included in the notes to the annual financial statements prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) have been omitted from these interim financial statements. CSX suggests that these financial statements be read in conjunction with the audited financial statements and the notes included in CSX's most recent annual report on Form 10-K and any subsequently filed current reports on Form 8-K.
Fiscal Year
Fiscal Year

CSX follows a 52/53 week fiscal reporting calendar with the last day of each reporting period ending on a Friday:
 
The third fiscal quarters of 2013 and 2012 consisted of 13 weeks ending on September 27, 2013 and September 28, 2012, respectively.
Fiscal year 2013 and 2012 will each consist of 52 weeks ending on December 27, 2013 and December 28, 2012, respectively.
    
Except as otherwise specified, references to “third quarter(s)” or “nine months” indicate CSX's fiscal periods ending September 27, 2013 and September 28, 2012, and references to "year-end" indicate the fiscal year ended December 28, 2012.
Allowance for Doubtfull Accounts
Allowance for Doubtful Accounts

The Company maintains an allowance for doubtful accounts on uncollectible amounts related to freight receivables, government reimbursement receivables, claims for damages and other various receivables. The allowance is based upon the credit worthiness of customers, historical experience, the age of the receivable and current market and economic conditions. Uncollectible amounts are charged against the allowance account.
New Accounting Pronouncements
New Accounting Pronouncements

In February 2013, the Financial Accounting Standards Board ("FASB") issued an Accounting Standards Update to the Comprehensive Income Topic in the Accounting Standards Codifications ("ASC"). This update requires separate presentation of the components that are reclassified out of accumulated other comprehensive income either on the face of the financial statements or in the notes to the financial statements. This update also requires companies to disclose the income statement line items impacted by any significant reclassifications, such as the amortization of pension and other post-employment benefits adjustments. These items are required for both interim and annual reporting for public companies and became effective for CSX beginning with the first quarter 2013 Form 10-Q filing.