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Nature of Operations and Significant Accounting Policies (Policies)
3 Months Ended
Mar. 27, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
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 three months ended March 27, 2015 and March 28, 2014;
Consolidated comprehensive income statements for the three months ended March 27, 2015 and March 28, 2014;
Consolidated balance sheets at March 27, 2015 and December 26, 2014; and
Consolidated cash flow statements for the three months ended March 27, 2015 and March 28, 2014.

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
CSX follows a 52/53 week fiscal reporting calendar with the last day of each reporting period ending on a Friday:
The first fiscal quarters of 2015 and 2014 consisted of 13 weeks ending on March 27, 2015 and March 28, 2014, respectively.
Fiscal year 2015 and 2014 will each consist of 52 weeks ending on December 25, 2015 and December 26, 2014, respectively.
    
Except as otherwise specified, references to “first quarter(s)” or “three months” indicate CSX's fiscal periods ending March 27, 2015 and March 28, 2014, and references to "year-end" indicate the fiscal year ended December 26, 2014.
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
In May 2014, the Financial Accounting Standards Board ("FASB") issued an Accounting Standards Update, Revenue from Contracts with Customers, which supersedes previous revenue recognition guidance. The new standard requires that a company recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration the company expects to receive in exchange for those goods or services. Companies will need to use more judgment and estimates than under the guidance currently in effect, including estimating the amount of variable revenue to recognize over each identified performance obligation. Additional disclosures will be required to help users of financial statements understand the nature, amount and timing of revenue and cash flows arising from contracts. In April 2015, the FASB voted for a one-year deferral of the effective date of the new revenue recognition standard. If approved, the new standard will become effective for CSX beginning with the first quarter 2018 and can be adopted either retrospectively to each prior reporting period presented or as a cumulative effect adjustment as of the date of adoption. The Company is currently evaluating the impact of adopting this new guidance on the consolidated financial statements.