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Nature of Operations and Significant Accounting Policies (Policies) | 9 Months Ended
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Sep. 28, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
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 2012 and 2011 consisted of 13 weeks ending on September 28, 2012 and September 30, 2011, respectively.
• | The nine month periods of 2012 and 2011 consisted of 39 weeks ending on September 28, 2012 and September 30, 2011, respectively.
• | Fiscal year 2012 and 2011 will each consist of 52 weeks ending on December 28, 2012 and December 30, 2011, respectively.
Except as otherwise specified, references to “third quarter(s)” or “nine months” indicate CSX's fiscal periods ending September 28, 2012 and September 30, 2011, and references to "year-end" indicate the fiscal year ended December 30, 2011.
Allowance for Doubtfull 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.

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- Definition Describes how an entity determines the level of its allowance for doubtful accounts for its trade and other accounts receivable balances, and when impairments, charge-offs or recoveries are recognized. The description should identify the factors that influenced management of the entity in establishing the level of the allowance (for example, historical losses and existing economic conditions) and may also include discussion of the risk elements relevant to particular categories of receivables. + References No definition available. + Details
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- Definition Disclosure of accounting policy for determining an entity's fiscal year or other fiscal period. This disclosure may include identification of the fiscal period end-date, the length of the fiscal period, any reporting period lag between the entity and its subsidiaries, or equity investees. If a reporting lag exists, the closing date of the entity having a different period end is generally noted, along with an explanation of the necessity for using different closing dates. Any intervening events that materially affect the entity's financial position or results of operations are generally also disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.3A-02.(b)) -URI http://asc.fasb.org/extlink&oid=6959686&loc=d3e355033-122828 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph b -Article 3A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph k -Article 1 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.3A-03.(b)) -URI http://asc.fasb.org/extlink&oid=6959686&loc=d3e355100-122828 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 06 -Article 3 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 3A -Section 03 -Paragraph b Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6921628&loc=d3e5291-111683 + Details
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