CSX (CSX) 10-Q 16 Apr 14 2014 Q1 Quarterly report Financial data

Document_And_Entity_Informatio

Document And Entity Information	3 Months Ended
	Mar. 28, 2014
Document and Entity Information [Abstract]	'
Entity Registrant Name	'CSX CORP
Entity Central Index Key	'0000277948
Current Fiscal Year End Date	'--12-26
Entity Filer Category	'Large Accelerated Filer
Entity Common Stock, Shares Outstanding	1,004,362,589
Document Fiscal Year Focus	'2014
Document Fiscal Period Focus	'Q1
Document Type	'10-Q
Amendment Flag	'false
Document Period End Date	28-Mar-14

CONSOLIDATED_INCOME_STATEMENTS

CONSOLIDATED INCOME STATEMENTS (Unaudited) (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 28, 2014	Mar. 29, 2013
Income Statement	'	'
Revenue	$3,012	$2,963
Expense	'	'
Labor and Fringe	814	767
Materials, Supplies and Other	629	507
Fuel	446	444
Depreciation	283	270
Equipment and Other Rents	101	95
Total Expense	2,273	2,083
Operating Income	739	880
Interest Expense	-140	-147
Other Income - Net	7	-3
Earnings Before Income Taxes	606	730
Income Tax Expense	-208	-268
Net Earnings	$398	$462
Per Common Share	'	'
Net Earnings Per Share, Basic (in dollars per share)	$0.40	$0.45
Net Earnings Per Share, Assuming Dilution (in dollars per share)	$0.40	$0.45
Average Shares Outstanding (in shares)	1,008	1,022
Average Shares Outstanding, Assuming Dilution (in shares)	1,008	1,023
Cash Dividends Paid Per Common Share (in dollars per share)	$0.15	$0.14

CONSOLIDATED_COMPREHENSIVE_INC

CONSOLIDATED COMPREHENSIVE INCOME STATEMENTS (Unaudited) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2014	Mar. 29, 2013
Statement of Comprehensive Income [Abstract]	'	'
Total Comprehensive Earnings	$414	$479

CONSOLIDATED_BALANCE_SHEETS_Un

CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $)	Mar. 28, 2014	Dec. 27, 2013	Mar. 29, 2013	Dec. 28, 2012
In Millions, unless otherwise specified
Current Assets	'	'	'	'
Cash and Cash Equivalents	$475	$592	$705	$784
Short-term Investments	248	487	'	'
Accounts Receivable - Net	1,073	1,052	'	'
Materials and Supplies	259	252	'	'
Deferred Income Taxes	143	155	'	'
Other Current Assets	91	64	'	'
Total Current Assets	2,289	2,602	'	'
Properties	37,604	37,184	'	'
Accumulated Depreciation	-10,110	-9,893	'	'
Properties - Net	27,494	27,291	'	'
Other Long-term Assets	583	591	'	'
Total Assets	31,680	31,782	'	'
Current Liabilities:	'	'	'	'
Accounts Payable	975	957	'	'
Labor and Fringe Benefits Payable	404	587	'	'
Casualty, Environmental and Other Reserves	149	151	'	'
Current Maturities of Long-term Debt	325	533	'	'
Income and Other Taxes Payable	246	91	'	'
Other Current Liabilities	113	105	'	'
Total Current Liabilities	2,212	2,424	'	'
Casualty, Environmental and Other Reserves	285	300	'	'
Long-term Debt	9,021	9,022	'	'
Deferred Income Taxes	8,658	8,662	'	'
Other Long-term Liabilities	859	870	'	'
Total Liabilities	21,035	21,278	'	'
Common Stock $1 Par Value	1,004	1,009	'	'
Other Capital	65	61	'	'
Retained Earnings	10,062	9,936	'	'
Accumulated Other Comprehensive Loss	-507	-523	'	'
Noncontrolling Interest	21	21	'	'
Total Shareholders' Equity	10,645	10,504	'	'
Total Liabilities and Shareholders' Equity	31,680	31,782	'	'
Investments in Conrail	'	'	'	'
Current Assets	'	'	'	'
Investment in Affiliates and Joint Ventures	756	752	'	'
Affiliates and Other Companies	'	'	'	'
Current Assets	'	'	'	'
Investment in Affiliates and Joint Ventures	$558	$546	'	'

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Mar. 28, 2014	Dec. 27, 2013
Stockholders' Equity:	'	'
Common stock, par value (in dollars per share)	$1	$1

CONSOLIDATED_CASH_FLOW_STATEME

CONSOLIDATED CASH FLOW STATEMENTS (Unaudited) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2014	Mar. 29, 2013
OPERATING ACTIVITIES	'	'
Net Earnings	$398	$462
Adjustments to Reconcile Net Earnings to Net Cash Provided by Operating Activities:	'	'
Depreciation	283	270
Deferred Income Taxes	-1	82
Gain on Property Dispositions	-1	-30
Other Operating Activities	-9	-57
Changes in Operating Assets and Liabilities:	'	'
Accounts Receivable	-46	-47
Other Current Assets	-41	-38
Accounts Payable	30	48
Income and Other Taxes Payable	159	129
Other Current Liabilities	-173	-88
Net Cash Provided by Operating Activities	599	731
INVESTING ACTIVITIES	'	'
Property Additions	-475	-491
Purchase of Short-term Investments	-165	-290
Proceeds from Sales of Short-term Investments	409	534
Other Investing Activities	4	-18
Net Cash Used in Investing Activities	-227	-265
FINANCING ACTIVITIES	'	'
Long-term debt repaid	-209	-413
Dividends Paid	-151	-143
Stock Options Exercised	0	6
Shares Repurchased	-127	0
Other Financing Activities	-2	5
Net Cash Used in Financing Activities	-489	-545
Net Decrease in Cash and Cash Equivalents	-117	-79
CASH AND CASH EQUIVALENTS	'	'
Cash and Cash Equivalents at Beginning of Period	592	784
Cash and Cash Equivalents at End of Period	$475	$705

Nature_of_Operations_and_Signi

Nature of Operations and Significant Accounting Policies	3 Months Ended
	Mar. 28, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Nature of Operations and Significant Accounting Policies	'
	Nature of Operations and Significant Accounting Policies
	Background
	CSX Corporation (“CSX”), and together with its subsidiaries (the “Company”), based in Jacksonville, Florida, is one of the nation's leading transportation companies. The Company provides rail-based transportation services including traditional rail service and the transport of intermodal containers and trailers.
	CSX's principal operating subsidiary, CSX Transportation, Inc. (“CSXT”), provides an important link to the transportation supply chain through its approximately 21,000 route mile rail network, which serves major population centers in 23 states east of the Mississippi River, the District of Columbia and the Canadian provinces of Ontario and Quebec. The Company's intermodal business, also part of CSXT, links customers to railroads via trucks and terminals.
	Other entities
	In addition to CSXT, the Company’s subsidiaries include CSX Intermodal Terminals, Inc. (“CSX Intermodal Terminals”), Total Distribution Services, Inc. (“TDSI”), Transflo Terminal Services, Inc. (“Transflo”), CSX Technology, Inc. (“CSX Technology”) and other subsidiaries. CSX Intermodal Terminals owns and operates a system of intermodal terminals, predominantly in the eastern United States and also performs drayage services (the pickup and delivery of intermodal shipments) for certain CSXT customers and trucking dispatch operations. TDSI serves the automotive industry with distribution centers and storage locations. Transflo connects non-rail served customers to the many benefits of rail by transferring products from rail to trucks. Today, the biggest Transflo markets are chemicals and agriculture, which includes shipments of plastics and ethanol. CSX Technology and other subsidiaries provide support services for the Company.
	CSX’s other holdings include CSX Real Property, Inc., a subsidiary responsible for the Company’s real estate sales, leasing, acquisition and management and development activities. These activities are classified in other income - net because they are not considered to be operating activities by the Company. Results of these activities fluctuate with the timing of non-operating real estate transactions.
	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 28, 2014 and March 29, 2013;
	•	Consolidated comprehensive income statements for the three months ended March 28, 2014 and March 29, 2013;
	•	Consolidated balance sheets at March 28, 2014 and December 27, 2013; and
	•	Consolidated cash flow statements for the three months ended March 28, 2014 and March 29, 2013.
	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.
	NOTE 1.    Nature of Operations and Significant Accounting Policies, continued
	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 2014 and 2013 consisted of 13 weeks ending on March 28, 2014 and March 29, 2013, respectively.
	•	Fiscal year 2014 and 2013 will each consist of 52 weeks ending on December 26, 2014 and December 27, 2013, respectively.
	Except as otherwise specified, references to “first quarter(s)” or “three months” indicate CSX's fiscal periods ending March 28, 2014 and March 29, 2013, and references to "year-end" indicate the fiscal year ended December 27, 2013.
	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. Allowance for doubtful accounts of $35 million and $33 million is included in the consolidated balance sheets as of the end of first quarter 2014 and December 2013, respectively.
	Other Items
	Revision of Prior Period Financial Statements
	During 2013, CSX completed a review of certain accounts receivable balances which resulted in an adjustment to previously reported revenue. This review identified immaterial differences between estimated and actual revenue earned on a small percentage of transactions as well as a small percentage of revenue over at least a decade. For information related to this prior period revision, see CSX's 2013 annual report on Form 10-K.
	Dividend Increase
	In April 2014, the Company announced a 7 percent increase in the quarterly dividend to $0.16 per common share, payable on June 13, 2014 to shareholders of record at the close of business on May 28, 2014.
	Share Repurchases
	In April 2013, the Company announced a new $1 billion share repurchase program, which is expected to be completed by April 2015. Management's assessment of market conditions and pertinent facts guide the timing and volume of all repurchases. Future share repurchases are expected to be funded by cash on hand, cash generated from operations and debt issuances. During first quarter 2014, CSX repurchased $127 million, or 5 million shares, of common stock under this program. In accordance with the Equity Topic in the ASC, the excess of repurchase price over par value is recorded in retained earnings. Generally, retained earnings is only impacted by net earnings and dividends.

Earnings_Per_Share

Earnings Per Share	3 Months Ended
	Mar. 28, 2014
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	Earnings Per Share
	The following table sets forth the computation of basic earnings per share and earnings per share, assuming dilution:
		First Quarters
		2014		2013
	Numerator (Dollars in millions):
	Net Earnings	$	398	$	462
	Denominator (Units in millions):
	Average Common Shares Outstanding	1,008		1,022
	Other Potentially Dilutive Common Shares	—		1
	Average Common Shares Outstanding,	1,008		1,023
	Assuming Dilution
	Net Earnings Per Share, Basic	$	0.4	$	0.45
	Net Earnings Per Share, Assuming Dilution	$	0.4	$	0.45
	Basic earnings per share is based on the weighted-average number of common stock outstanding. Earnings per share, assuming dilution, is based on the weighted-average number of shares of common stock outstanding adjusted for the effects of common stock that may be issued as a result of the following types of potentially dilutive instruments:
	•	convertible debt;
	•	in prior periods, employee stock options (all stock options expired in May 2013); and
	•	other equity awards, which include long-term incentive awards.
	The Earnings Per Share Topic in the ASC requires CSX to include additional shares in the computation of earnings per share, assuming dilution. The additional shares included in diluted earnings per share represent the number of shares that would be issued if all of the above potentially dilutive instruments were converted into CSX common stock.

ShareBased_Compensation

Share-Based Compensation	3 Months Ended
	Mar. 28, 2014
Share-based Compensation [Abstract]	'
Share-Based Compensation	'
	Share-Based Compensation
	Under CSX's share-based compensation plans, awards primarily consist of performance grants, restricted stock awards, restricted stock units and stock grants for directors. Awards granted under the various programs are determined and approved by the Compensation Committee of the Board of Directors or, in certain circumstances, by the Chief Executive Officer for awards to management employees other than senior executives. The Board of Directors approves awards granted to the Company's non-management directors upon recommendation of the Governance Committee. Total pre-tax expense associated with all share-based compensation and the related income tax benefit are as follows:
		First Quarters
	(Dollars in millions)	2014			2013
	Share-Based Compensation (Expense) / Benefit (a)	$	(5	)	$	3
	Income Tax Benefit / (Expense)	2			(1		)
	(a) Share-based compensation was a benefit in first quarter 2013 driven by a reduction in the expected payouts on long-term incentive compensation.

Casualty_Environmental_and_Oth

Casualty, Environmental and Other Reserves	3 Months Ended
	Mar. 28, 2014
Casualty, Environmental and Other Reserves [Abstract]	'
Casualty, Environmental and Other Reserves	'
	Casualty, Environmental and Other Reserves
	Casualty, environmental and other reserves are considered critical accounting estimates due to the need for significant management judgment. They are provided for in the consolidated balance sheets as follows:
		March 28,						December 27,
		2014						2013
	(Dollars in millions)	Current		Long-term		Total		Current		Long-term		Total
	Casualty:
	Personal Injury	$	60	$	139	$	199	$	59	$	148	$	207
	Occupational	3		20		23		3		20		23
	Asbestos	10		40		50		10		40		50
	Total Casualty	73		199		272		72		208		280
	Environmental	59		38		97		59		41		100
	Other	17		48		65		20		51		71
	Total	$	149	$	285	$	434	$	151	$	300	$	451
	These liabilities are accrued when estimable and probable in accordance with the Contingencies Topic in the ASC. Actual settlements and claims received could differ. The final outcome of these matters cannot be predicted with certainty. Considering the legal defenses currently available, the liabilities that have been recorded and other factors, it is the opinion of management that none of these items individually, when finally resolved, will have a material effect on the Company's financial condition, results of operations or liquidity. Should a number of these items occur in the same period, however, they could have a material effect on the Company's financial condition, results of operations or liquidity in that particular period.
	Casualty
	Casualty reserves of $272 million as of the end of first quarter 2014 represent accruals for personal injury, occupational injury and asbestos claims. The Company's self-insured retention amount for these claims is $50 million per occurrence. Currently, no individual claim is expected to exceed the self-insured retention amount. In accordance with the Contingencies Topic in the ASC, to the extent the value of an individual claim exceeds the self-insured retention amount, the Company would present the liability on a gross basis with a corresponding receivable for insurance recoveries. These reserves fluctuate based upon the timing of payments as well as changes in independent third-party estimates, which are reviewed by management. Actual results may vary from estimates due to the number, type and severity of the injury, costs of medical treatments and uncertainties in litigation. Most of the Company's casualty claims relate to CSXT unless otherwise noted below. Defense and processing costs, which historically have been insignificant and are anticipated to be insignificant in the future, are not included in the recorded liabilities.
	Personal Injury
	Personal injury reserves represent liabilities for employee work-related and third-party injuries. Work-related injuries for CSXT employees are primarily subject to the Federal Employers’ Liability Act (“FELA”). In addition to FELA liabilities, employees of other CSX subsidiaries are covered by various state workers’ compensation laws, the Federal Longshore and Harbor Workers’ Compensation Program or the Maritime Jones Act.
	NOTE 4. Casualty, Environmental and Other Reserves, continued
	CSXT retains an independent actuarial firm to assist management in assessing the value of personal injury claims. An analysis is performed by the independent actuarial firm quarterly and is reviewed by management. The methodology used by the actuary includes a development factor to reflect growth or reduction in the value of these personal injury claims. It is based largely on CSXT's historical claims and settlement experience.
	Occupational & Asbestos
	Occupational claims arise from allegations of exposures to certain materials in the workplace, such as solvents, soaps, chemicals (collectively referred to as “irritants”) and diesel fuels (like exhaust fumes) or allegations of chronic physical injuries resulting from work conditions, such as repetitive stress injuries, carpal tunnel syndrome and hearing loss. The Company is also party to a number of asbestos claims by current or former employees alleging exposure to asbestos in the workplace.
	Occupational and asbestos claims are analyzed by a third-party actuary or specialist (the "third-party specialist"), respectively, in order to determine the number of unasserted or incurred but not reported (“IBNR”) claims. Occupational claims analyses are performed by the third-party specialist quarterly and are reviewed by management. Since exposure to asbestos has been substantially eliminated, management reviews asserted asbestos claims quarterly and the review by the third-party specialist is completed annually.
	The third-party specialists analyze CSXT's historical claim filings, settlement amounts, and dismissal rates to determine future anticipated claim filing rates and average settlement values for occupational and asbestos claims reserves. The potentially exposed population is estimated by using CSX's employment records and industry data. From this analysis, the third-party specialists provide an estimate of the IBNR claims liability.
	Environmental
	Environmental reserves were $97 million as of the end of first quarter 2014. The Company is a party to various proceedings related to environmental issues, including administrative and judicial proceedings involving private parties and regulatory agencies. The Company has been identified as a potentially responsible party at approximately 256 environmentally impaired sites. Many of these are, or may be, subject to remedial action under the federal Comprehensive Environmental Response, Compensation and Liability Act of 1980, or CERCLA, also known as the Superfund Law, or similar state statutes. Most of these proceedings arose from environmental conditions on properties used for ongoing or discontinued railroad operations. A number of these proceedings, however, are based on allegations that the Company, or its predecessors, sent hazardous substances to facilities owned or operated by others for treatment, recycling or disposal. In addition, some of the Company's land holdings were leased to others for commercial or industrial uses that may have resulted in releases of hazardous substances or other regulated materials onto the property and could give rise to proceedings against the Company.
	In any such proceedings, the Company is subject to environmental clean-up and enforcement actions under the Superfund Law, as well as similar state laws that may impose joint and several liability for clean-up and enforcement costs on current and former owners and operators of a site without regard to fault or the legality of the original conduct. These costs could be substantial.
	NOTE 4. Casualty, Environmental and Other Reserves, continued
	In accordance with the Asset Retirement and Environmental Obligations Topic in the ASC, the Company reviews its role with respect to each site identified at least quarterly, giving consideration to a number of factors such as:
	•	type of clean-up required;
	•	nature of the Company's alleged connection to the location (e.g., generator of waste sent to the site or owner or operator of the site);
	•	extent of the Company's alleged connection (e.g., volume of waste sent to the location and other relevant factors); and
	•	number, connection and financial viability of other named and unnamed potentially responsible parties at the location.
	Based on the review process, the Company has recorded amounts to cover contingent anticipated future environmental remediation costs with respect to each site to the extent such costs are estimable and probable. The recorded liabilities for estimated future environmental costs are undiscounted. The liability includes future costs for remediation and restoration of sites as well as any significant ongoing monitoring costs, but excludes any anticipated insurance recoveries. Payments related to these liabilities are expected to be made over the next several years.
	Currently, the Company does not possess sufficient information to reasonably estimate the amounts of additional liabilities, if any, on some sites until completion of future environmental studies. In addition, conditions that are currently unknown could, at any given location, result in additional exposure, the amount and materiality of which cannot presently be reasonably estimated. Based upon information currently available, however, the Company believes its environmental reserves accurately reflect the cost of remedial actions currently required.
	Other
	Other reserves of $65 million as of the end of first quarter 2014 include liabilities for various claims, such as longshoremen disability claims, and claims for property, automobile and general liability.

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 28, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	Commitments and Contingencies
	Insurance
	The Company maintains numerous insurance programs with substantial limits for property damage (which includes business interruption) and third-party liability.  A certain amount of risk is retained by the Company on each of the property and liability programs.  The Company has a $25 million retention per occurrence for the non-catastrophic property program (such as a derailment) and a $50 million retention per occurrence for the liability and catastrophic property programs (such as hurricanes and floods). While the Company believes its current insurance coverage is adequate, future claims could exceed existing insurance coverage or insurance may not continue to be available at commercially reasonable rates.
	NOTE 5.    Commitments and Contingencies, continued
	Legal
	The Company is involved in litigation incidental to its business and is a party to a number of legal actions and claims, various governmental proceedings and private civil lawsuits, including, but not limited to, those related to fuel surcharge practices, environmental and hazardous material exposure matters, FELA claims by employees, other personal injury or property claims and disputes and complaints involving certain transportation rates and charges. Some of the legal proceedings include claims for compensatory as well as punitive damages and others are, or are purported to be, class actions. While the final outcome of these matters cannot be reasonably determined, considering, among other things, the legal defenses available and liabilities that have been recorded along with applicable insurance, it is currently the opinion of CSX management that none of these pending items will have a material adverse effect on the Company's financial condition, results of operations or liquidity. An unexpected adverse resolution of one or more of these items, however, could have a material adverse effect on the Company's financial condition, results of operations or liquidity in that particular period.
	The Company is able to estimate a range of possible loss for certain legal proceedings for which a loss is reasonably possible in excess of reserves established. The Company has estimated this range to be $3 million to $14 million in aggregate at March 28, 2014. This estimated aggregate range is based upon currently available information and is subject to significant judgment and a variety of assumptions. Accordingly, the Company's estimate will change from time to time, and actual losses may vary significantly from the current estimate.
	Fuel Surcharge Antitrust Litigation
	In May 2007, class action lawsuits were filed against CSXT and three other U.S.-based Class I railroads alleging that the defendants' fuel surcharge practices relating to contract and unregulated traffic resulted from an illegal conspiracy in violation of antitrust laws. In November 2007, the class action lawsuits were consolidated and are now pending in federal court in the District of Columbia. The suit seeks treble damages allegedly sustained by purported class members as well as attorneys' fees and other relief. Plaintiffs are expected to allege damages at least equal to the fuel surcharges at issue.
	In June 2012, the District Court certified the case as a class action. The decision was not a ruling on the merits of plaintiffs' claims, rather a decision to allow the plaintiffs to seek to prove the case as a class. The defendant railroads petitioned the U.S. Court of Appeals for the D.C. Circuit for permission to appeal the District Court's class certification decision. In August 2013, the D.C. Circuit issued a decision vacating the class certification decision and remanded the case to the District Court to reconsider its class certification decision. On October 15, 2013, the District Court held a case management conference to determine the scope and schedule of the remand proceedings.  The District Court has ordered briefing on class certification to be completed by the end of May 2014, and in the interim, has deferred proceedings on the merits of the case.
	CSXT believes that its fuel surcharge practices were arrived at and applied lawfully and that the case is without merit. Accordingly, the Company intends to defend itself vigorously. However, penalties for violating antitrust laws can be severe, and an unexpected adverse decision on the merits could have a material adverse effect on the Company's financial condition, results of operations or liquidity in that particular period or for the full year.
	NOTE 5.    Commitments and Contingencies, continued
	Environmental
	CSXT has certain indemnification requirements with respect to Pharmacia LLC (formerly known as Monsanto Company) for certain liabilities associated with real estate formerly owned by Pharmacia that is now owned by CSXT in Kearny, New Jersey (the “Property”).  The indemnification and defense duties arise with respect to several matters.  The State of New Jersey filed suit in 2005 against Occidental Chemical Corporation, Tierra Solutions Inc., Maxus Energy Corporation and five other companies seeking cleanup and removal costs and other damages associated with the presence of dioxin and other hazardous substances in the sediment of the Newark Bay Complex, which includes a 17-mile stretch of the Passaic River near the Property. In 2009, Pharmacia, along with hundreds of other companies, was served with a third-party complaint by Tierra Solutions Inc. and Maxus Energy Corporation seeking contribution towards the costs and damages claimed by the state of New Jersey or incurred by Tierra and Maxus related to the Newark Bay Complex.  CSXT has been participating in the defense of this matter with and on behalf of Pharmacia.  In 2013, Pharmacia, along with most of the other third-party defendants, entered into a settlement agreement with the state of New Jersey for an amount that is not material to CSXT.  The settlement, approved by the Superior Court of New Jersey in December 2013, resolves certain claims or potential claims by the state of New Jersey for costs and damages arising from discharges to the Newark Bay Complex.  CSXT, on behalf of Pharmacia, is also conducting a Remedial Investigation and Feasibility Study of the 17-mile Lower Passaic River Study Area with approximately 70 other parties pursuant to an Administrative Order on Consent with the U.S. Environmental Protection Agency ("EPA"). The Company does not believe any remediation costs potentially allocable to CSXT would be material to the Company's financial condition, results of operations or liquidity. On April 11, 2014, the EPA announced its proposed plan to remediate the lower eight miles of the Lower Passaic River.  The proposed plan, based on a Focused Feasibility Study, informs the public of EPA’s preferred remedial alternative and solicits public comment.  After review of comments, EPA is expected to issue its final cleanup plan early next year.

Employee_Benefit_Plans

Employee Benefit Plans	3 Months Ended
	Mar. 28, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]	'
Employee Benefit Plans	'
	Employee Benefit Plans
	The Company sponsors defined benefit pension plans principally for salaried, management personnel.  For employees hired on or before December 31, 2002, the plans provide eligible employees with retirement benefits based predominantly on years of service and compensation rates near retirement.  For employees hired in 2003 or thereafter, benefits are determined based on a cash balance formula, which provides benefits by utilizing interest and pay credits based upon age, service and compensation.
	In addition to these plans, the Company sponsors a post-retirement medical plan and a life insurance plan that provide benefits to full-time, salaried, management employees, hired prior to January 1, 2003, upon their retirement if certain eligibility requirements are met.  Medicare-eligible retirees are covered by a health reimbursement arrangement, which is an employer-funded account that can be used for reimbursement of eligible medical expenses. Non-Medicare eligible retirees are covered by a self-insured program partially funded by participating retirees.  The life insurance plan is non-contributory.
	NOTE 6.    Employee Benefit Plans, continued
	The Company engages independent actuaries to compute the amounts of liabilities and expenses relating to these plans subject to the assumptions that the Company selects.  These amounts are reviewed by management.  The following table describes the components of expense / (income) related to net benefit expense:
		Pension Benefits
	(Dollars in millions)	First Quarters
		2014			2013
	Service Cost	$	11		$	12
	Interest Cost	31			27
	Expected Return on Plan Assets	(41		)	(40		)
	Amortization of Net Loss	14			25
	Total Expense	$	15		$	24
		Other Post-retirement Benefits
	(Dollars in millions)	First Quarters
		2014			2013
	Service Cost	$	1		$	1
	Interest Cost	3			3
	Amortization of Net Loss	1			3
	Total Expense	$	5		$	7
	Qualified pension plan obligations are funded in accordance with prescribed regulatory requirements and with an objective of meeting minimum funding requirements necessary to avoid restrictions on flexibility of plan operation and benefit payments.  At this time, the Company anticipates that no further contributions to its qualified pension plans will be required in 2014.

Debt_and_Credit_Agreements

Debt and Credit Agreements	3 Months Ended
	Mar. 28, 2014
Debt Disclosure [Abstract]	'
Debt and Credit Agreements	'
	Debt and Credit Agreements
	Total activity related to long-term debt as of the end of first quarter 2014 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 2013	$	533		$	9,022		$	9,555
	2014 activity:
	Long-term debt repaid	(209		)	—			(209		)
	Discount, premium and other activity	1			(1		)	—
	Long-term debt as of first quarter 2014	$	325		$	9,021		$	9,346
	Credit Facility
	CSX has a $1 billion unsecured, revolving credit facility backed by a diverse syndicate of banks. This facility expires in September 2016, and as of the date of this filing, the Company has no outstanding balances under this facility. The facility allows borrowings at floating (LIBOR-based) interest rates, plus a spread, depending upon CSX's senior unsecured debt ratings. LIBOR is the London Interbank Offered Rate which is a daily reference rate based on the interest rates at which banks offer to lend unsecured funds. As of first quarter 2014, CSX was in compliance with all covenant requirements under this facility.
	NOTE 7.    Debt and Credit Agreements, continued
	Receivables Securitization Facility
	The Company's $250 million receivables securitization facility has a 364-day term and expires in December 2014. The purpose of this facility is to provide an alternative to commercial paper and a low cost source of short-term liquidity. The Company anticipates either renewing the facility or replacing it with another liquidity-based solution. As of the date of this filing, the Company has no outstanding balances under this facility.

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 28, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	During the first quarter of 2014, the state of Indiana enacted legislation reducing the future corporate income tax rate. A net $21 million income tax benefit was recognized primarily as a result of this legislation and the related revaluation of deferred tax liabilities. There have been no material changes to the balance of unrecognized tax benefits during first quarters 2014 and 2013.

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Mar. 28, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	Fair Value Measurements
	The Financial Instruments Topic in the ASC requires disclosures about fair value of financial instruments in annual reports as well as in quarterly reports. For CSX, this statement applies to certain investments and long-term debt. Disclosure of the fair value of pension plan assets is only required annually. Also, this rule clarifies the definition of fair value for financial reporting, establishes a framework for measuring fair value and requires additional disclosures about the use of fair value measurements.
	Various inputs are considered when determining the value of the Company's investments, pension plan assets and long-term debt. The inputs or methodologies used for valuing securities are not necessarily an indication of the risk associated with investing in these securities. These inputs are summarized in the three broad levels listed below.
	•	Level 1 - observable market inputs that are unadjusted quoted prices for identical assets or liabilities in active markets
	•	Level 2 - other significant observable inputs (including quoted prices for similar securities, interest rates, credit risk, etc.)
	•	Level 3 - significant unobservable inputs (including the Company's own assumptions in determining the fair value of investments)
	The valuation methods described below may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, while the Company believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date.
	NOTE 9.    Fair Value Measurements, continued
	Investments
	The Company's investment assets, valued with assistance from a third-party trustee, consist of certificates of deposits, commercial paper, corporate bonds, government securities and auction rate securities and are carried at fair value on the consolidated balance sheet per the Fair Value Measurements and Disclosures Topic in the ASC. There are several valuation methodologies used for those assets as described below.
	•	Certificates of Deposit and Commercial Paper (Level 2): Valued by discounting the related cash flows based on current yields of similar instruments with comparable durations.
	•	Corporate Bonds and Government Securities (Level 2): Valued using price evaluations reflecting the bid and/or ask sides of the market for a similar investment as of the last day of the period.
	•	Auction Rate Securities (Level 3): Valued using a discounted cash flow model, because there is currently no active market for trading.
	The Company's investment assets are carried at fair value on the consolidated balance sheets as summarized in the table below. Additionally, the amortized cost basis of these investments was $422 million and $668 million as of March 28, 2014 and December 27, 2013, respectively.
		March 28,									December 27,
		2014									2013
	(Dollars in Millions)	Level 1		Level 2			Level 3		Total		Level 1		Level 2		Level 3		Total
	Certificates of Deposit and Commercial Paper	$	—	$	230		$	—	$	230	$	—	$	472	$	—	$	472
	Corporate Bonds	—		129			—		129		—		132		—		132
	Government Securities	—		49			—		49		—		49		—		49
	Auction Rate Securities	—		—			15		15		—		—		15		15
	Total investments at fair value	$	—	$	408		$	15	$	423	$	—	$	653	$	15	$	668
	These investments have the following maturities:
	(Dollars in millions)	March 28,			December 27,
		2014			2013
	Less than 1 year	$	248		$	487
	1 - 2 years	70			58
	2 - 5 years	87			105
	Greater than 5 years	18			18
	Total	$	423		$	668
	NOTE 9.    Fair Value Measurements, continued
	Long-term Debt
	Long-term debt is reported at carrying amount on the consolidated balance sheets and is the Company's only financial instrument with fair values significantly different from their carrying amounts. The majority of the Company's long-term debt is valued with assistance from an independent third party who utilizes closing transactions, market quotes or market values of comparable debt. For those instruments not valued by the third party, the fair value has been estimated by applying market rates of similar instruments to the scheduled contractual debt payments and maturities. These market rates are provided by the same third party. All of the inputs used to determine the fair value of the Company's long-term debt are Level 2 inputs.
	The fair value of outstanding debt fluctuates with changes in a number of factors. Such factors include, but are not limited to, interest rates, market conditions, values of similar financial instruments, size of the transaction, cash flow projections and comparable trades. Fair value will exceed carrying value when the current market interest rate is lower than the interest rate at which the debt was originally issued. The fair value of a company's debt is a measure of its current value under present market conditions. It does not impact the financial statements under current accounting rules.
	The fair value and carrying value of the Company's long-term debt is as follows:
	(Dollars in millions)	March 28,			December 27, 2013
		2014
	Long-term Debt (Including Current Maturities):
	Fair Value	$	10,411		$	10,354
	Carrying Value	$	9,346		$	9,555

Other_Comprehensive_Income

Other Comprehensive Income	3 Months Ended
	Mar. 28, 2014
Equity [Abstract]	'
Other Comprehensive Income	'
	Other Comprehensive Income
	CSX reports comprehensive earnings or loss in accordance with the Comprehensive Income Topic in the ASC in the Consolidated Comprehensive Income Statement. Total comprehensive earnings are defined as all changes in shareholders' equity during a period, other than those resulting from investments by and distributions to shareholders (e.g. issuance of equity securities and dividends). Generally, for CSX, total comprehensive earnings equals net earnings plus or minus adjustments for pension and other post-retirement liabilities. Total comprehensive earnings represent the activity for a period net of tax and were $414 million and $479 million for first quarters 2014 and 2013, respectively.
	NOTE 10.     Other Comprehensive Income, continued
	While total comprehensive earnings is the activity in a period and is largely driven by net earnings in that period, accumulated other comprehensive income or loss (“AOCI”) represents the cumulative balance of other comprehensive income, net of tax, as of the balance sheet date. For CSX, AOCI is primarily the cumulative balance related to pension and other post-retirement benefit adjustments and CSX's share of AOCI of equity method investees. Changes in the AOCI balance by component are shown in the table below.
		Pension and Other Post-Employment Benefits			Other (b)			Accumulated Other Comprehensive Income (Loss)
	(Dollars in millions)
	Balance December 27, 2013, Net of Tax	$	(462	)	$	(61	)	$	(523	)
	Other Comprehensive Income
	Amounts Reclassified to Net Earnings (a)	15			8			23
	Tax Expense	(6		)	(1		)	(7		)
	Total Other Comprehensive Income	9			7			16
	Balance March 28, 2014, Net of Tax	$	(453	)	$	(54	)	$	(507	)
	(a) Amounts reclassified to net earnings primarily relate to the amortization of actuarial losses and are included in labor and fringe on the consolidated income statements. See Note 6. Employee Benefit Plans for further information.
	(b) Other primarily represents CSX's share of AOCI of equity method investees. Amounts reclassified to net earnings are included in materials, supplies and other on the consolidated income statements.

Summarized_Consolidating_Finan

Summarized Consolidating Financial Data	3 Months Ended
	Mar. 28, 2014
Summarized Consolidating Financial Data [Abstract]	'
Summarized Consolidating Financial Data	'
	Summarized Consolidating Financial Data
	In 2007, CSXT, a wholly-owned subsidiary of CSX Corporation, sold secured equipment notes maturing in 2023, and in 2008, CSXT sold additional secured equipment notes maturing in 2014 in registered public offerings.  CSX has fully and unconditionally guaranteed the notes. In connection with the notes, the Company is providing the following condensed consolidating financial information in accordance with SEC disclosure requirements. Each entity in the consolidating financial information follows the same accounting policies as described in the consolidated financial statements, except for the use of the equity method of accounting to reflect ownership interests in subsidiaries which are eliminated upon consolidation and the allocation of certain expenses of CSX incurred for the benefit of its subsidiaries. Condensed consolidating financial information for the obligor, CSXT, and parent guarantor, CSX, is shown in the tables below.
	Consolidating Income Statements
	(Dollars in millions)
	First Quarter 2014	CSX Corporation			CSX Transportation			Eliminations and Other			Consolidated
	Revenue	$	—		$	2,992		$	20		$	3,012
	Expense	(103		)	2,393			(17		)	2,273
	Operating Income	103			599			37			739
	Equity in Earnings of Subsidiaries	416			—			(416		)	—
	Interest (Expense) / Benefit	(130		)	(14		)	4			(140		)
	Other Income / (Expense) - Net	(2		)	6			3			7
	Earnings Before Income Taxes	387			591			(372		)	606
	Income Tax Benefit / (Expense)	11			(204		)	(15		)	(208		)
	Net Earnings	$	398		$	387		$	(387	)	$	398
	Total Comprehensive Earnings	$	414		$	393		$	(393	)	$	414
	First Quarter 2013	CSX Corporation			CSX Transportation			Eliminations and Other			Consolidated
	Revenue	$	—		$	2,946		$	17		$	2,963
	Expense	(93		)	2,217			(41		)	2,083
	Operating Income	93			729			58			880
	Equity in Earnings of Subsidiaries	489			(1		)	(488		)	—
	Interest (Expense) / Benefit	(134		)	(17		)	4			(147		)
	Other Income / (Expense) - Net	(1		)	2			(4		)	(3		)
	Earnings Before Income Taxes	447			713			(430		)	730
	Income Tax (Expense) / Benefit	15			(264		)	(19		)	(268		)
	Net Earnings	$	462		$	449		$	(449	)	$	462
	Total Comprehensive Earnings	$	479		$	449		$	(449	)	$	479
	Consolidating Balance Sheet
	(Dollars in millions)
	As of March 2014	CSX Corporation			CSX Transportation			Eliminations and Other			Consolidated
	ASSETS
	Current Assets
	Cash and Cash Equivalents	$	321		$	91		$	63		$	475
	Short-term Investments	230			—			18			248
	Accounts Receivable - Net	3			191			879			1,073
	Receivable from Affiliates	1,301			2,323			(3,624		)	—
	Materials and Supplies	—			259			—			259
	Deferred Income Taxes	(11		)	155			(1		)	143
	Other Current Assets	(1		)	86			6			91
	Total Current Assets	1,843			3,105			(2,659		)	2,289
	Properties	1			35,377			2,226			37,604
	Accumulated Depreciation	(1		)	(8,965		)	(1,144		)	(10,110		)
	Properties - Net	—			26,412			1,082			27,494
	Investments in Conrail	—			—			756			756
	Affiliates and Other Companies	(39		)	624			(27		)	558
	Investments in Consolidated Subsidiaries	20,506			—			(20,506		)	—
	Other Long-term Assets	214			388			(19		)	583
	Total Assets	$	22,524		$	30,529		$	(21,373	)	$	31,680
	LIABILITIES AND SHAREHOLDERS' EQUITY
	Current Liabilities
	Accounts Payable	$	190		$	758		$	27		$	975
	Labor and Fringe Benefits Payable	33			340			31			404
	Payable to Affiliates	3,063			539			(3,602		)	—
	Casualty, Environmental and Other Reserves	—			133			16			149
	Current Maturities of Long-term Debt	—			325			—			325
	Income and Other Taxes Payable	(102		)	342			6			246
	Other Current Liabilities	—			109			4			113
	Total Current Liabilities	3,184			2,546			(3,518		)	2,212
	Casualty, Environmental and Other Reserves	—			218			67			285
	Long-term Debt	8,308			713			—			9,021
	Deferred Income Taxes	(70		)	8,541			187			8,658
	Other Long-term Liabilities	478			506			(125		)	859
	Total Liabilities	$	11,900		$	12,524		$	(3,389	)	$	21,035
	Shareholders' Equity
Common Stock, $1 Par Value	$	1,004		$	181		$	(181	)	$	1,004
Other Capital	65			5,077			(5,077		)	65
Retained Earnings	10,062			12,759			(12,759		)	10,062
Accumulated Other Comprehensive Loss	(507		)	(37		)	37			(507		)
Noncontrolling Interest	—			25			(4		)	21
Total Shareholders' Equity	$	10,624		$	18,005		$	(17,984	)	$	10,645
Total Liabilities and Shareholders' Equity	$	22,524		$	30,529		$	(21,373	)	$	31,680
Consolidating Balance Sheet
(Dollars in millions)
As of December 2013	CSX Corporation			CSX Transportation			Eliminations and Other			Consolidated
ASSETS
Current Assets
Cash and Cash Equivalents	$	439		$	91		$	62		$	592
Short-term Investments	472			—			15			487
Accounts Receivable - Net	3			240			809			1,052
Receivable from Affiliates	1,141			2,635			(3,776		)	—
Materials and Supplies	—			252			—			252
Deferred Income Taxes	(5		)	161			(1		)	155
Other Current Assets	1			57			6			64
Total Current Assets	2,051			3,436			(2,885		)	2,602
Properties	1			34,987			2,196			37,184
Accumulated Depreciation	(1		)	(8,778		)	(1,114		)	(9,893		)
Properties - Net	—			26,209			1,082			27,291
Investments in Conrail	—			—			752			752
Affiliates and Other Companies	(39		)	612			(27		)	546
Investment in Consolidated Subsidiaries	20,226			—			(20,226		)	—
Other Long-term Assets	217			388			(14		)	591
Total Assets	$	22,455		$	30,645		$	(21,318	)	$	31,782
LIABILITIES AND SHAREHOLDERS' EQUITY
Current Liabilities
Accounts Payable	$	110		$	809		$	38		$	957
Labor and Fringe Benefits Payable	38			491			58			587
Payable to Affiliates	3,298			535			(3,833		)	—
Casualty, Environmental and Other Reserves	—			136			15			151
Current Maturities of Long-term Debt	200			333			—			533
Income and Other Taxes Payable	(397		)	479			9			91
Other Current Liabilities	—			103			2			105
Total Current Liabilities	3,249			2,886			(3,711		)	2,424
Casualty, Environmental and Other Reserves	—			231			69			300
Long-term Debt	8,308			714			—			9,022
Deferred Income Taxes	(64		)	8,548			178			8,662
Other Long-term Liabilities	479			512			(121		)	870
Total Liabilities	$	11,972		$	12,891		$	(3,585	)	$	21,278
Shareholders' Equity
Common Stock, $1 Par Value	$	1,009		$	181		$	(181	)	$	1,009
Other Capital	61			5,077			(5,077		)	61
Retained Earnings	9,936			12,514			(12,514		)	9,936
Accumulated Other Comprehensive Loss	(523		)	(43		)	43			(523		)
Noncontrolling Minority Interest	—			25			(4		)	21
Total Shareholders' Equity	$	10,483		$	17,754		$	(17,733	)	$	10,504
Total Liabilities and Shareholders' Equity	$	22,455		$	30,645		$	(21,318	)	$	31,782
Consolidating Cash Flow Statements
(Dollars in millions)
Three months ended March 28, 2014	CSX			CSX			Eliminations and Other			Consolidated
	Corporation			Transportation
Operating Activities
Net Cash Provided by (Used in) Operating Activities	$	113		$	669		$	(183	)	$	599
Investing Activities
Property Additions	—			(443		)	(32		)	(475		)
Purchases of Short-term Investments	(165		)	—			—			(165		)
Proceeds from Sales of Short-term Investments	407			—			2			409
Other Investing Activities	—			(67		)	71			4
Net Cash Provided by (Used in) Investing Activities	242			(510		)	41			(227		)
Financing Activities
Long-term Debt Repaid	(200		)	(9		)	—			(209		)
Dividends Paid	(151		)	(143		)	143			(151		)
Shares Repurchased	(127		)	—			—			(127		)
Other Financing Activities	5			(7		)	—			(2		)
Net Cash Provided by (Used in) Financing Activities	(473		)	(159		)	143			(489		)
Net Increase (Decrease) in Cash and Cash Equivalents	(118		)	—			1			(117		)
Cash and Cash Equivalents at Beginning of Period	439			91			62			592
Cash and Cash Equivalents at End of Period	$	321		$	91		$	63		$	475
NOTE 11.    Summarized Consolidating Financial Data, continued
Consolidating Cash Flow Statements
(Dollars in millions)
Three months ended March 29, 2013	CSX			CSX			Eliminations and Other			Consolidated
	Corporation			Transportation
Operating Activities
Net Cash Provided by (Used in) Operating Activities	$	272		$	689		$	(230	)	$	731
Investing Activities
Property Additions	—			(458		)	(33		)	(491		)
Purchases of Short-term Investments	(285		)	—			(5		)	(290		)
Proceeds from Sales of Short-term Investments	510			—			24			534
Other Investing Activities	—			(63		)	45			(18		)
Net Cash Provided by (Used in) Investing Activities	225			(521		)	31			(265		)
Financing Activities
Long-term Debt Repaid	(400		)	(13		)	—			(413		)
Dividends Paid	(143		)	(182		)	182			(143		)
Stock Options Exercised	6			—			—			6
Other Financing Activities	4			—			1			5
Net Cash Provided by (Used in) Financing Activities	(533		)	(195		)	183			(545		)
Net Increase (Decrease) in Cash and Cash Equivalents	(36		)	(27		)	(16		)	(79		)
Cash and Cash Equivalents at Beginning of Period	481			235			68			784
Cash and Cash Equivalents at End of Period	$	445		$	208		$	52		$	705

Nature_of_Operations_and_Signi1

Nature of Operations and Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 28, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Basis of Presentation	'
	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 28, 2014 and March 29, 2013;
	•	Consolidated comprehensive income statements for the three months ended March 28, 2014 and March 29, 2013;
	•	Consolidated balance sheets at March 28, 2014 and December 27, 2013; and
	•	Consolidated cash flow statements for the three months ended March 28, 2014 and March 29, 2013.
	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 first fiscal quarters of 2014 and 2013 consisted of 13 weeks ending on March 28, 2014 and March 29, 2013, respectively.
	•	Fiscal year 2014 and 2013 will each consist of 52 weeks ending on December 26, 2014 and December 27, 2013, respectively.
	Except as otherwise specified, references to “first quarter(s)” or “three months” indicate CSX's fiscal periods ending March 28, 2014 and March 29, 2013, and references to "year-end" indicate the fiscal year ended December 27, 2013.
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.
Revision of Prior Period Financial Statements	'
	Revision of Prior Period Financial Statements
	During 2013, CSX completed a review of certain accounts receivable balances which resulted in an adjustment to previously reported revenue. This review identified immaterial differences between estimated and actual revenue earned on a small percentage of transactions as well as a small percentage of revenue over at least a decade. For information related to this prior period revision, see CSX's 2013 annual report on Form 10-K.
Share Repurchases	'
	Dividend Increase
	In April 2014, the Company announced a 7 percent increase in the quarterly dividend to $0.16 per common share, payable on June 13, 2014 to shareholders of record at the close of business on May 28, 2014.
	Share Repurchases
	In April 2013, the Company announced a new $1 billion share repurchase program, which is expected to be completed by April 2015. Management's assessment of market conditions and pertinent facts guide the timing and volume of all repurchases. Future share repurchases are expected to be funded by cash on hand, cash generated from operations and debt issuances. During first quarter 2014, CSX repurchased $127 million, or 5 million shares, of common stock under this program. In accordance with the Equity Topic in the ASC, the excess of repurchase price over par value is recorded in retained earnings. Generally, retained earnings is only impacted by net earnings and dividends.

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	3 Months Ended
	Mar. 28, 2014
Earnings Per Share [Abstract]	'
Computation of basic and diluted earnings per share	'
	The following table sets forth the computation of basic earnings per share and earnings per share, assuming dilution:
		First Quarters
		2014		2013
	Numerator (Dollars in millions):
	Net Earnings	$	398	$	462
	Denominator (Units in millions):
	Average Common Shares Outstanding	1,008		1,022
	Other Potentially Dilutive Common Shares	—		1
	Average Common Shares Outstanding,	1,008		1,023
	Assuming Dilution
	Net Earnings Per Share, Basic	$	0.4	$	0.45
	Net Earnings Per Share, Assuming Dilution	$	0.4	$	0.45

ShareBased_Compensation_Tables

Share-Based Compensation (Tables)	3 Months Ended
	Mar. 28, 2014
Share-based Compensation [Abstract]	'
Share-based compensation and related income tax benefit	'
	Total pre-tax expense associated with all share-based compensation and the related income tax benefit are as follows:
		First Quarters
	(Dollars in millions)	2014			2013
	Share-Based Compensation (Expense) / Benefit (a)	$	(5	)	$	3
	Income Tax Benefit / (Expense)	2			(1		)
	(a) Share-based compensation was a benefit in first quarter 2013 driven by a reduction in the expected payouts on long-term incentive compensation.

Casualty_Environmental_and_Oth1

Casualty, Environmental and Other Reserves (Tables)	3 Months Ended
	Mar. 28, 2014
Casualty, Environmental and Other Reserves [Abstract]	'
Casualty, environmental and other reserves	'
	Casualty, environmental and other reserves are considered critical accounting estimates due to the need for significant management judgment. They are provided for in the consolidated balance sheets as follows:
		March 28,						December 27,
		2014						2013
	(Dollars in millions)	Current		Long-term		Total		Current		Long-term		Total
	Casualty:
	Personal Injury	$	60	$	139	$	199	$	59	$	148	$	207
	Occupational	3		20		23		3		20		23
	Asbestos	10		40		50		10		40		50
	Total Casualty	73		199		272		72		208		280
	Environmental	59		38		97		59		41		100
	Other	17		48		65		20		51		71
	Total	$	149	$	285	$	434	$	151	$	300	$	451

Employee_Benefit_Plans_Tables

Employee Benefit Plans (Tables)	3 Months Ended
	Mar. 28, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]	'
Components of expense/(income) related to net benefit expense	'
	The following table describes the components of expense / (income) related to net benefit expense:
		Pension Benefits
	(Dollars in millions)	First Quarters
		2014			2013
	Service Cost	$	11		$	12
	Interest Cost	31			27
	Expected Return on Plan Assets	(41		)	(40		)
	Amortization of Net Loss	14			25
	Total Expense	$	15		$	24
		Other Post-retirement Benefits
	(Dollars in millions)	First Quarters
		2014			2013
	Service Cost	$	1		$	1
	Interest Cost	3			3
	Amortization of Net Loss	1			3
	Total Expense	$	5		$	7

Debt_and_Credit_Agreements_Tab

Debt and Credit Agreements (Tables)	3 Months Ended
	Mar. 28, 2014
Debt Disclosure [Abstract]	'
Activity related to long-term debt	'
	Total activity related to long-term debt as of the end of first quarter 2014 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 2013	$	533		$	9,022		$	9,555
	2014 activity:
	Long-term debt repaid	(209		)	—			(209		)
	Discount, premium and other activity	1			(1		)	—
	Long-term debt as of first quarter 2014	$	325		$	9,021		$	9,346

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 28, 2014
Fair Value Disclosures [Abstract]	'
Schedule of fair value of investment assets	'
	The Company's investment assets are carried at fair value on the consolidated balance sheets as summarized in the table below. Additionally, the amortized cost basis of these investments was $422 million and $668 million as of March 28, 2014 and December 27, 2013, respectively.
		March 28,									December 27,
		2014									2013
	(Dollars in Millions)	Level 1		Level 2			Level 3		Total		Level 1		Level 2		Level 3		Total
	Certificates of Deposit and Commercial Paper	$	—	$	230		$	—	$	230	$	—	$	472	$	—	$	472
	Corporate Bonds	—		129			—		129		—		132		—		132
	Government Securities	—		49			—		49		—		49		—		49
	Auction Rate Securities	—		—			15		15		—		—		15		15
	Total investments at fair value	$	—	$	408		$	15	$	423	$	—	$	653	$	15	$	668
Schedule of investment maturities	'
	These investments have the following maturities:
	(Dollars in millions)	March 28,			December 27,
		2014			2013
	Less than 1 year	$	248		$	487
	1 - 2 years	70			58
	2 - 5 years	87			105
	Greater than 5 years	18			18
	Total	$	423		$	668
Schedule of fair value and carrying value of long-term debt	'
	The fair value and carrying value of the Company's long-term debt is as follows:
	(Dollars in millions)	March 28,			December 27, 2013
		2014
	Long-term Debt (Including Current Maturities):
	Fair Value	$	10,411		$	10,354
	Carrying Value	$	9,346		$	9,555

Other_Comprehensive_Income_Tab

Other Comprehensive Income (Tables)	3 Months Ended
	Mar. 28, 2014
Equity [Abstract]	'
Changes in AOCI balance by component	'
	Changes in the AOCI balance by component are shown in the table below.
		Pension and Other Post-Employment Benefits			Other (b)			Accumulated Other Comprehensive Income (Loss)
	(Dollars in millions)
	Balance December 27, 2013, Net of Tax	$	(462	)	$	(61	)	$	(523	)
	Other Comprehensive Income
	Amounts Reclassified to Net Earnings (a)	15			8			23
	Tax Expense	(6		)	(1		)	(7		)
	Total Other Comprehensive Income	9			7			16
	Balance March 28, 2014, Net of Tax	$	(453	)	$	(54	)	$	(507	)
	(a) Amounts reclassified to net earnings primarily relate to the amortization of actuarial losses and are included in labor and fringe on the consolidated income statements. See Note 6. Employee Benefit Plans for further information.
	(b) Other primarily represents CSX's share of AOCI of equity method investees. Amounts reclassified to net earnings are included in materials, supplies and other on the consolidated income statements.

Summarized_Consolidating_Finan1

Summarized Consolidating Financial Data (Tables)	3 Months Ended
	Mar. 28, 2014
Summarized Consolidating Financial Data [Abstract]	'
Consolidating Income Statements	'
	Consolidating Income Statements
	(Dollars in millions)
	First Quarter 2014	CSX Corporation			CSX Transportation			Eliminations and Other			Consolidated
	Revenue	$	—		$	2,992		$	20		$	3,012
	Expense	(103		)	2,393			(17		)	2,273
	Operating Income	103			599			37			739
	Equity in Earnings of Subsidiaries	416			—			(416		)	—
	Interest (Expense) / Benefit	(130		)	(14		)	4			(140		)
	Other Income / (Expense) - Net	(2		)	6			3			7
	Earnings Before Income Taxes	387			591			(372		)	606
	Income Tax Benefit / (Expense)	11			(204		)	(15		)	(208		)
	Net Earnings	$	398		$	387		$	(387	)	$	398
	Total Comprehensive Earnings	$	414		$	393		$	(393	)	$	414
	First Quarter 2013	CSX Corporation			CSX Transportation			Eliminations and Other			Consolidated
	Revenue	$	—		$	2,946		$	17		$	2,963
	Expense	(93		)	2,217			(41		)	2,083
	Operating Income	93			729			58			880
	Equity in Earnings of Subsidiaries	489			(1		)	(488		)	—
	Interest (Expense) / Benefit	(134		)	(17		)	4			(147		)
	Other Income / (Expense) - Net	(1		)	2			(4		)	(3		)
	Earnings Before Income Taxes	447			713			(430		)	730
	Income Tax (Expense) / Benefit	15			(264		)	(19		)	(268		)
	Net Earnings	$	462		$	449		$	(449	)	$	462
	Total Comprehensive Earnings	$	479		$	449		$	(449	)	$	479
Consolidating Balance Sheet	'
	Consolidating Balance Sheet
	(Dollars in millions)
	As of March 2014	CSX Corporation			CSX Transportation			Eliminations and Other			Consolidated
	ASSETS
	Current Assets
	Cash and Cash Equivalents	$	321		$	91		$	63		$	475
	Short-term Investments	230			—			18			248
	Accounts Receivable - Net	3			191			879			1,073
	Receivable from Affiliates	1,301			2,323			(3,624		)	—
	Materials and Supplies	—			259			—			259
	Deferred Income Taxes	(11		)	155			(1		)	143
	Other Current Assets	(1		)	86			6			91
	Total Current Assets	1,843			3,105			(2,659		)	2,289
	Properties	1			35,377			2,226			37,604
	Accumulated Depreciation	(1		)	(8,965		)	(1,144		)	(10,110		)
	Properties - Net	—			26,412			1,082			27,494
	Investments in Conrail	—			—			756			756
	Affiliates and Other Companies	(39		)	624			(27		)	558
	Investments in Consolidated Subsidiaries	20,506			—			(20,506		)	—
	Other Long-term Assets	214			388			(19		)	583
	Total Assets	$	22,524		$	30,529		$	(21,373	)	$	31,680
	LIABILITIES AND SHAREHOLDERS' EQUITY
	Current Liabilities
	Accounts Payable	$	190		$	758		$	27		$	975
	Labor and Fringe Benefits Payable	33			340			31			404
	Payable to Affiliates	3,063			539			(3,602		)	—
	Casualty, Environmental and Other Reserves	—			133			16			149
	Current Maturities of Long-term Debt	—			325			—			325
	Income and Other Taxes Payable	(102		)	342			6			246
	Other Current Liabilities	—			109			4			113
	Total Current Liabilities	3,184			2,546			(3,518		)	2,212
	Casualty, Environmental and Other Reserves	—			218			67			285
	Long-term Debt	8,308			713			—			9,021
	Deferred Income Taxes	(70		)	8,541			187			8,658
	Other Long-term Liabilities	478			506			(125		)	859
	Total Liabilities	$	11,900		$	12,524		$	(3,389	)	$	21,035
	Shareholders' Equity
	Common Stock, $1 Par Value	$	1,004		$	181		$	(181	)	$	1,004
	Other Capital	65			5,077			(5,077		)	65
	Retained Earnings	10,062			12,759			(12,759		)	10,062
	Accumulated Other Comprehensive Loss	(507		)	(37		)	37			(507		)
	Noncontrolling Interest	—			25			(4		)	21
	Total Shareholders' Equity	$	10,624		$	18,005		$	(17,984	)	$	10,645
	Total Liabilities and Shareholders' Equity	$	22,524		$	30,529		$	(21,373	)	$	31,680
	Consolidating Balance Sheet
	(Dollars in millions)
	As of December 2013	CSX Corporation			CSX Transportation			Eliminations and Other			Consolidated
	ASSETS
	Current Assets
	Cash and Cash Equivalents	$	439		$	91		$	62		$	592
	Short-term Investments	472			—			15			487
	Accounts Receivable - Net	3			240			809			1,052
	Receivable from Affiliates	1,141			2,635			(3,776		)	—
	Materials and Supplies	—			252			—			252
	Deferred Income Taxes	(5		)	161			(1		)	155
	Other Current Assets	1			57			6			64
	Total Current Assets	2,051			3,436			(2,885		)	2,602
	Properties	1			34,987			2,196			37,184
	Accumulated Depreciation	(1		)	(8,778		)	(1,114		)	(9,893		)
	Properties - Net	—			26,209			1,082			27,291
	Investments in Conrail	—			—			752			752
	Affiliates and Other Companies	(39		)	612			(27		)	546
	Investment in Consolidated Subsidiaries	20,226			—			(20,226		)	—
Other Long-term Assets	217			388			(14		)	591
Total Assets	$	22,455		$	30,645		$	(21,318	)	$	31,782
LIABILITIES AND SHAREHOLDERS' EQUITY
Current Liabilities
Accounts Payable	$	110		$	809		$	38		$	957
Labor and Fringe Benefits Payable	38			491			58			587
Payable to Affiliates	3,298			535			(3,833		)	—
Casualty, Environmental and Other Reserves	—			136			15			151
Current Maturities of Long-term Debt	200			333			—			533
Income and Other Taxes Payable	(397		)	479			9			91
Other Current Liabilities	—			103			2			105
Total Current Liabilities	3,249			2,886			(3,711		)	2,424
Casualty, Environmental and Other Reserves	—			231			69			300
Long-term Debt	8,308			714			—			9,022
Deferred Income Taxes	(64		)	8,548			178			8,662
Other Long-term Liabilities	479			512			(121		)	870
Total Liabilities	$	11,972		$	12,891		$	(3,585	)	$	21,278
Shareholders' Equity
Common Stock, $1 Par Value	$	1,009		$	181		$	(181	)	$	1,009
Other Capital	61			5,077			(5,077		)	61
Retained Earnings	9,936			12,514			(12,514		)	9,936
Accumulated Other Comprehensive Loss	(523		)	(43		)	43			(523		)
Noncontrolling Minority Interest	—			25			(4		)	21
Total Shareholders' Equity	$	10,483		$	17,754		$	(17,733	)	$	10,504
Total Liabilities and Shareholders' Equity	$	22,455		$	30,645		$	(21,318	)	$	31,782
Consolidating Cash Flow Statements	'
	Consolidating Cash Flow Statements
	(Dollars in millions)
	Three months ended March 28, 2014	CSX			CSX			Eliminations and Other			Consolidated
		Corporation			Transportation
	Operating Activities
	Net Cash Provided by (Used in) Operating Activities	$	113		$	669		$	(183	)	$	599
	Investing Activities
	Property Additions	—			(443		)	(32		)	(475		)
	Purchases of Short-term Investments	(165		)	—			—			(165		)
	Proceeds from Sales of Short-term Investments	407			—			2			409
	Other Investing Activities	—			(67		)	71			4
	Net Cash Provided by (Used in) Investing Activities	242			(510		)	41			(227		)
	Financing Activities
	Long-term Debt Repaid	(200		)	(9		)	—			(209		)
	Dividends Paid	(151		)	(143		)	143			(151		)
	Shares Repurchased	(127		)	—			—			(127		)
	Other Financing Activities	5			(7		)	—			(2		)
	Net Cash Provided by (Used in) Financing Activities	(473		)	(159		)	143			(489		)
	Net Increase (Decrease) in Cash and Cash Equivalents	(118		)	—			1			(117		)
	Cash and Cash Equivalents at Beginning of Period	439			91			62			592
	Cash and Cash Equivalents at End of Period	$	321		$	91		$	63		$	475
	NOTE 11.    Summarized Consolidating Financial Data, continued
	Consolidating Cash Flow Statements
	(Dollars in millions)
	Three months ended March 29, 2013	CSX			CSX			Eliminations and Other			Consolidated
		Corporation			Transportation
	Operating Activities
	Net Cash Provided by (Used in) Operating Activities	$	272		$	689		$	(230	)	$	731
	Investing Activities
	Property Additions	—			(458		)	(33		)	(491		)
	Purchases of Short-term Investments	(285		)	—			(5		)	(290		)
	Proceeds from Sales of Short-term Investments	510			—			24			534
	Other Investing Activities	—			(63		)	45			(18		)
	Net Cash Provided by (Used in) Investing Activities	225			(521		)	31			(265		)
	Financing Activities
	Long-term Debt Repaid	(400		)	(13		)	—			(413		)
	Dividends Paid	(143		)	(182		)	182			(143		)
	Stock Options Exercised	6			—			—			6
	Other Financing Activities	4			—			1			5
	Net Cash Provided by (Used in) Financing Activities	(533		)	(195		)	183			(545		)
	Net Increase (Decrease) in Cash and Cash Equivalents	(36		)	(27		)	(16		)	(79		)
	Cash and Cash Equivalents at Beginning of Period	481			235			68			784
	Cash and Cash Equivalents at End of Period	$	445		$	208		$	52		$	705

Nature_of_Operations_and_Signi2

Nature of Operations and Significant Accounting Policies (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2014	Mar. 29, 2013	Dec. 27, 2013
	mi
	states
Background	'	'	'
Total number of rail route miles	21,000	'	'
Rail network states number	23	'	'
Fiscal Year	'	'	'
Number of weeks in fiscal quarter ytd	'91 days	'91 days	'
Number of weeks in fiscal year	'364 days	'364 days	'
Number of Weeks Fiscal Quarter	'91 days	'91 days	'
Allowance for Doubtful Accounts	'	'	'
Allowance for doubtful accounts	$35	'	$33

Nature_of_Operations_and_Signi3

Nature of Operations and Significant Accounting Policies (Share Repurchases and Dividend Increase) (Details) (USD $)	1 Months Ended	3 Months Ended		0 Months Ended
Share data in Millions, except Per Share data, unless otherwise specified	Apr. 30, 2013	Mar. 28, 2014	Mar. 29, 2013	Apr. 16, 2014
				Subsequent Event [Member]
Dividends Payable [Line Items]	'	'	'	'
Increase in quarterly dividend rate (percent)	'	'	'	7.00%
Quarterly dividends (in US$ per share)	'	'	'	$0.16
Share repurchase program	$1,000,000,000	'	'	'
Shares Repurchased	'	$127,000,000	$0	'
Shares repurchased during the period (shares)	'	5	'	'

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 28, 2014	Mar. 29, 2013
Numerator:	'	'
Net Earnings	$398	$462
Denominator:	'	'
Average Common Shares Outstanding (in shares)	1,008	1,022
Other Potentially Dilutive Common Shares (in shares)	0	1
Average Common Shares Outstanding, Assuming Dilution (in shares)	1,008	1,023
Net Earnings Per Share, Basic (in dollars per share):	$0.40	$0.45
Net Earnings Per Share, Assuming Dilution (in dollars per share):	$0.40	$0.45

ShareBased_Compensation_Detail

Share-Based Compensation (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2014		Mar. 29, 2013
Share-based Compensation [Abstract]	'		'
Share-Based Compensation (Expense) / Benefit (a)	($5)	[1]	$3	[1]
Income Tax Benefit / (Expense)	$2		($1)
[1]	Share-based compensation was a benefit in first quarter 2013 driven by a reduction in the expected payouts on long-term incentive compensation.

Casualty_Environmental_and_Oth2

Casualty, Environmental and Other Reserves (Details) (USD $)	Mar. 28, 2014	Dec. 27, 2013
In Millions, unless otherwise specified
All Contingencies Reserves [Line Items]	'	'
Loss Contingency, Accrual, Current	$149	$151
Loss Contingency, Accrual, Noncurrent	285	300
Casualty [Member]	'	'
All Contingencies Reserves [Line Items]	'	'
Loss Contingency, Accrual, Current	73	72
Loss Contingency, Accrual, Noncurrent	199	208
Loss Contingency, Accrual, Total	272	280
Self-insured retention amount, per occurrence	50	'
Number of Claims Expected to Exceed Self Insured Retention Amount	0	'
Personal Injury [Member]	'	'
All Contingencies Reserves [Line Items]	'	'
Loss Contingency, Accrual, Current	60	59
Loss Contingency, Accrual, Noncurrent	139	148
Loss Contingency, Accrual, Total	199	207
Occupational [Member]	'	'
All Contingencies Reserves [Line Items]	'	'
Loss Contingency, Accrual, Current	3	3
Loss Contingency, Accrual, Noncurrent	20	20
Loss Contingency, Accrual, Total	23	23
Asbestos [Member]	'	'
All Contingencies Reserves [Line Items]	'	'
Loss Contingency, Accrual, Current	10	10
Loss Contingency, Accrual, Noncurrent	40	40
Loss Contingency, Accrual, Total	50	50
Environmental [Member]	'	'
All Contingencies Reserves [Line Items]	'	'
Loss Contingency, Accrual, Current	59	59
Loss Contingency, Accrual, Noncurrent	38	41
Loss Contingency, Accrual, Total	97	100
Environmental impaired sites	256	'
Other [Member]	'	'
All Contingencies Reserves [Line Items]	'	'
Loss Contingency, Accrual, Current	17	20
Loss Contingency, Accrual, Noncurrent	48	51
Loss Contingency, Accrual, Total	65	71
Casualty, Environmental and Other [Member]	'	'
All Contingencies Reserves [Line Items]	'	'
Loss Contingency, Accrual, Current	149	151
Loss Contingency, Accrual, Noncurrent	285	300
Loss Contingency, Accrual, Total	$434	$451

Commitments_and_Contingencies_

Commitments and Contingencies (Details) (USD $)	1 Months Ended	3 Months Ended	12 Months Ended
In Millions, unless otherwise specified	31-May-07	Mar. 28, 2014	Dec. 31, 2005
	entity	mi	mi
		company	company
Insurance	'	'	'
Non-catastrophic property deductible	'	$25	'
Casualty and catastrophic property deductible	'	50	'
Legal	'	'	'
Range of possible loss for certain legal proceedings, minimum	'	3	'
Range of possible loss for certain legal proceedings, maximum	'	$14	'
Class action lawsuits filed against U.S.-based Class I railroads, excluding CSXT (number of entities)	3	'	'
Additional companies named in suit	'	'	5
Number of miles of Passaic River to be studied by EPA	'	17	17
Number of other parties conducting a Remedial Investigation and Feasibility Study	'	70	'

Employee_Benefit_Plans_Details

Employee Benefit Plans (Details) (USD $)	3 Months Ended
	Mar. 28, 2014	Mar. 29, 2013
Components of expense/ (income) related to net benefit expense:	'	'
Employer contribution to qualified pension plans, required minimum amount	$0	'
Pension Benefits [Member]	'	'
Components of expense/ (income) related to net benefit expense:	'	'
Service Cost	11,000,000	12,000,000
Interest Cost	31,000,000	27,000,000
Expected Return on Plan Assets	-41,000,000	-40,000,000
Amortization of Net Loss	14,000,000	25,000,000
Total Expense	15,000,000	24,000,000
Other Post-retirement Benefits [Member]	'	'
Components of expense/ (income) related to net benefit expense:	'	'
Service Cost	1,000,000	1,000,000
Interest Cost	3,000,000	3,000,000
Amortization of Net Loss	1,000,000	3,000,000
Total Expense	$5,000,000	$7,000,000

Debt_and_Credit_Agreements_Det

Debt and Credit Agreements (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2014	Mar. 29, 2013
Movement, Debt Instruments [Roll Forward]	'	'
Current Portion	$533	'
Long-term Portion	9,022	'
Long-term Debt, Total	9,555	'
Long-term debt repaid	-209	-413
Discount, premium and other activity	0	'
Current Portion	325	'
Long-term Debt Portion	9,021	'
Long-term Debt, Total	9,346	'
Current Portion	'	'
Movement, Debt Instruments [Roll Forward]	'	'
Current Portion	533	'
Long-term debt repaid	-209	'
Discount, premium and other activity	1	'
Current Portion	325	'
Long-term Portion	'	'
Movement, Debt Instruments [Roll Forward]	'	'
Long-term Portion	9,022	'
Long-term debt repaid	0	'
Discount, premium and other activity	-1	'
Long-term Debt Portion	$9,021	'

Debt_and_Credit_Agreements_Lin

Debt and Credit Agreements - Line of Credit Facility (Details) (USD $)	3 Months Ended
	Mar. 28, 2014
Revolving credit facility	'
Line of Credit Facility	'
Line of credit facility, current borrowing capacity	$1,000,000,000
Line of Credit Facility, Expiration Date	30-Sep-16
Line of credit facility, amount outstanding	0
Receivable securitization facility	'
Line of Credit Facility	'
Line of credit facility, current borrowing capacity	250,000,000
Debt Instrument, Term	'364 days
Line of Credit Facility, Expiration Date	19-Dec-14
Line of credit facility, amount outstanding	$0

Income_Taxes_Income_Taxes_Deta

Income Taxes Income Taxes (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2014
Income Tax Disclosure [Abstract]	'
Income tax benefit	$21

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)	Mar. 28, 2014	Dec. 27, 2013
In Millions, unless otherwise specified
Fair Value	'	'
Fair Value, by Balance Sheet Grouping	'	'
Investments	$423	$668
Fair Value | Less than 1 year	'	'
Fair Value, by Balance Sheet Grouping	'	'
Investments	248	487
Fair Value | 1 - 2 years	'	'
Fair Value, by Balance Sheet Grouping	'	'
Investments	70	58
Fair Value | 2 - 5 years	'	'
Fair Value, by Balance Sheet Grouping	'	'
Investments	87	105
Fair Value | Greater than 5 years	'	'
Fair Value, by Balance Sheet Grouping	'	'
Investments	18	18
Fair Value | Certificates of Deposit and Commercial Paper	'	'
Fair Value, by Balance Sheet Grouping	'	'
Investments	230	472
Fair Value | Corporate Bonds	'	'
Fair Value, by Balance Sheet Grouping	'	'
Investments	129	132
Fair Value | Government Securities	'	'
Fair Value, by Balance Sheet Grouping	'	'
Investments	49	49
Fair Value | Auction Rate Securities	'	'
Fair Value, by Balance Sheet Grouping	'	'
Investments	15	15
Fair Value | Level 1	'	'
Fair Value, by Balance Sheet Grouping	'	'
Investments	0	0
Fair Value | Level 1 | Certificates of Deposit and Commercial Paper	'	'
Fair Value, by Balance Sheet Grouping	'	'
Investments	0	0
Fair Value | Level 1 | Corporate Bonds	'	'
Fair Value, by Balance Sheet Grouping	'	'
Investments	0	0
Fair Value | Level 1 | Government Securities	'	'
Fair Value, by Balance Sheet Grouping	'	'
Investments	0	0
Fair Value | Level 1 | Auction Rate Securities	'	'
Fair Value, by Balance Sheet Grouping	'	'
Investments	0	0
Fair Value | Level 2	'	'
Fair Value, by Balance Sheet Grouping	'	'
Investments	408	653
Long-term Debt (Including Current Maturities)	10,411	10,354
Fair Value | Level 2 | Certificates of Deposit and Commercial Paper	'	'
Fair Value, by Balance Sheet Grouping	'	'
Investments	230	472
Fair Value | Level 2 | Corporate Bonds	'	'
Fair Value, by Balance Sheet Grouping	'	'
Investments	129	132
Fair Value | Level 2 | Government Securities	'	'
Fair Value, by Balance Sheet Grouping	'	'
Investments	49	49
Fair Value | Level 2 | Auction Rate Securities	'	'
Fair Value, by Balance Sheet Grouping	'	'
Investments	0	0
Fair Value | Level 3	'	'
Fair Value, by Balance Sheet Grouping	'	'
Investments	15	15
Fair Value | Level 3 | Certificates of Deposit and Commercial Paper	'	'
Fair Value, by Balance Sheet Grouping	'	'
Investments	0	0
Fair Value | Level 3 | Corporate Bonds	'	'
Fair Value, by Balance Sheet Grouping	'	'
Investments	0	0
Fair Value | Level 3 | Government Securities	'	'
Fair Value, by Balance Sheet Grouping	'	'
Investments	0	0
Fair Value | Level 3 | Auction Rate Securities	'	'
Fair Value, by Balance Sheet Grouping	'	'
Investments	15	15
Carrying Value	'	'
Fair Value, by Balance Sheet Grouping	'	'
Amortized cost basis of investments	422	668
Carrying Value | Level 2	'	'
Fair Value, by Balance Sheet Grouping	'	'
Long-term Debt (Including Current Maturities)	$9,346	$9,555

Other_Comprehensive_Income_Det

Other Comprehensive Income (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2014		Mar. 29, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]	'		'
Total Comprehensive Earnings	$414		$479
Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'		'
Balance December 27, 2013, Net of Tax	-523		'
Other Comprehensive Income	'		'
Amounts Reclassified to Net Earnings	23	[1]	'
Tax Expense	-7		'
Total Other Comprehensive Income	16		'
Balance March 28, 2014, Net of Tax	-507		'
Pension and Other Post-Employment Benefits	'		'
Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'		'
Balance December 27, 2013, Net of Tax	-462		'
Other Comprehensive Income	'		'
Amounts Reclassified to Net Earnings	15	[1]	'
Tax Expense	-6		'
Total Other Comprehensive Income	9		'
Balance March 28, 2014, Net of Tax	-453		'
Other	'		'
Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'		'
Balance December 27, 2013, Net of Tax	-61	[2]	'
Other Comprehensive Income	'		'
Amounts Reclassified to Net Earnings	8	[1],[2]	'
Tax Expense	-1	[2]	'
Total Other Comprehensive Income	7	[2]	'
Balance March 28, 2014, Net of Tax	($54)	[2]	'
[1]	Amounts reclassified to net earnings primarily relate to the amortization of actuarial losses and are included in labor and fringe on the consolidated income statements. See Note 6. Employee Benefit Plans for further information.
[2]	Other primarily represents CSX's share of AOCI of equity method investees. Amounts reclassified to net earnings are included in materials, supplies and other on the consolidated income statements.

Summarized_Consolidating_Incom

Summarized Consolidating Income Statements (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2014	Mar. 29, 2013
Consolidated Income Statement	'	'
Revenue	$3,012	$2,963
Expense	2,273	2,083
Operating Income	739	880
Equity in Earnings of Subsidiaries	0	0
Interest (Expense) / Benefit	-140	-147
Other Income / (Expense) - Net	7	-3
Earnings Before Income Taxes	606	730
Income Tax (Expense) / Benefit	-208	-268
Net Earnings	398	462
Total Comprehensive Earnings	414	479
CSX Corporation	'	'
Consolidated Income Statement	'	'
Revenue	0	0
Expense	-103	-93
Operating Income	103	93
Equity in Earnings of Subsidiaries	416	489
Interest (Expense) / Benefit	-130	-134
Other Income / (Expense) - Net	-2	-1
Earnings Before Income Taxes	387	447
Income Tax (Expense) / Benefit	11	15
Net Earnings	398	462
Total Comprehensive Earnings	414	479
CSX Transportation	'	'
Consolidated Income Statement	'	'
Revenue	2,992	2,946
Expense	2,393	2,217
Operating Income	599	729
Equity in Earnings of Subsidiaries	0	-1
Interest (Expense) / Benefit	-14	-17
Other Income / (Expense) - Net	6	2
Earnings Before Income Taxes	591	713
Income Tax (Expense) / Benefit	-204	-264
Net Earnings	387	449
Total Comprehensive Earnings	393	449
Eliminations and Other	'	'
Consolidated Income Statement	'	'
Revenue	20	17
Expense	-17	-41
Operating Income	37	58
Equity in Earnings of Subsidiaries	-416	-488
Interest (Expense) / Benefit	4	4
Other Income / (Expense) - Net	3	-4
Earnings Before Income Taxes	-372	-430
Income Tax (Expense) / Benefit	-15	-19
Net Earnings	-387	-449
Total Comprehensive Earnings	($393)	($449)

Summarized_Consolidating_Balan

Summarized Consolidating Balance Sheet (Details) (USD $)	Mar. 28, 2014	Dec. 27, 2013	Mar. 29, 2013	Dec. 28, 2012
In Millions, unless otherwise specified
Current Assets	'	'	'	'
Cash and Cash Equivalents	$475	$592	$705	$784
Short-term Investments	248	487	'	'
Accounts Receivable - Net	1,073	1,052	'	'
Receivable from Affiliates	0	0	'	'
Materials and Supplies	259	252	'	'
Deferred Income Taxes	143	155	'	'
Other Current Assets	91	64	'	'
Total Current Assets	2,289	2,602	'	'
Properties	37,604	37,184	'	'
Accumulated Depreciation	-10,110	-9,893	'	'
Properties - Net	27,494	27,291	'	'
Other Long-term Assets	583	591	'	'
Total Assets	31,680	31,782	'	'
Current Liabilities:	'	'	'	'
Accounts Payable	975	957	'	'
Labor and Fringe Benefits Payable	404	587	'	'
Payable to Affiliates	0	0	'	'
Casualty, Environmental and Other Reserves	149	151	'	'
Current Maturities of Long-term Debt	325	533	'	'
Income and Other Taxes Payable	246	91	'	'
Other Current Liabilities	113	105	'	'
Total Current Liabilities	2,212	2,424	'	'
Casualty, Environmental and Other Reserves	285	300	'	'
Long-term Debt	9,021	9,022	'	'
Deferred Income Taxes	8,658	8,662	'	'
Other Long-term Liabilities	859	870	'	'
Total Liabilities	21,035	21,278	'	'
Shareholders' Equity	'	'	'	'
Common Stock $1 Par Value	1,004	1,009	'	'
Other Capital	65	61	'	'
Retained Earnings	10,062	9,936	'	'
Accumulated Other Comprehensive Loss	-507	-523	'	'
Noncontrolling Interest	21	21	'	'
Total Shareholders' Equity	10,645	10,504	'	'
Total Liabilities and Shareholders' Equity	31,680	31,782	'	'
Casualty, Environmental and Other [Member]	'	'	'	'
Current Liabilities:	'	'	'	'
Casualty, Environmental and Other Reserves	149	151	'	'
Casualty, Environmental and Other Reserves	285	300	'	'
Investments in Conrail	'	'	'	'
Current Assets	'	'	'	'
Investment in Affiliates, Subsidiaries, and Joint Ventures	756	752	'	'
Affiliates and Other Companies	'	'	'	'
Current Assets	'	'	'	'
Investment in Affiliates, Subsidiaries, and Joint Ventures	558	546	'	'
Investments in Consolidated Subsidiaries	'	'	'	'
Current Assets	'	'	'	'
Investment in Affiliates, Subsidiaries, and Joint Ventures	0	0	'	'
CSX Corporation	'	'	'	'
Current Assets	'	'	'	'
Cash and Cash Equivalents	321	439	445	481
Short-term Investments	230	472	'	'
Accounts Receivable - Net	3	3	'	'
Receivable from Affiliates	1,301	1,141	'	'
Materials and Supplies	0	0	'	'
Deferred Income Taxes	-11	-5	'	'
Other Current Assets	-1	1	'	'
Total Current Assets	1,843	2,051	'	'
Properties	1	1	'	'
Accumulated Depreciation	-1	-1	'	'
Properties - Net	0	0	'	'
Other Long-term Assets	214	217	'	'
Total Assets	22,524	22,455	'	'
Current Liabilities:	'	'	'	'
Accounts Payable	190	110	'	'
Labor and Fringe Benefits Payable	33	38	'	'
Payable to Affiliates	3,063	3,298	'	'
Current Maturities of Long-term Debt	0	200	'	'
Income and Other Taxes Payable	-102	-397	'	'
Other Current Liabilities	0	0	'	'
Total Current Liabilities	3,184	3,249	'	'
Long-term Debt	8,308	8,308	'	'
Deferred Income Taxes	-70	-64	'	'
Other Long-term Liabilities	478	479	'	'
Total Liabilities	11,900	11,972	'	'
Shareholders' Equity	'	'	'	'
Common Stock $1 Par Value	1,004	1,009	'	'
Other Capital	65	61	'	'
Retained Earnings	10,062	9,936	'	'
Accumulated Other Comprehensive Loss	-507	-523	'	'
Noncontrolling Interest	0	0	'	'
Total Shareholders' Equity	10,624	10,483	'	'
Total Liabilities and Shareholders' Equity	22,524	22,455	'	'
CSX Corporation | Casualty, Environmental and Other [Member]	'	'	'	'
Current Liabilities:	'	'	'	'
Casualty, Environmental and Other Reserves	0	0	'	'
Casualty, Environmental and Other Reserves	0	0	'	'
CSX Corporation | Investments in Conrail	'	'	'	'
Current Assets	'	'	'	'
Investment in Affiliates, Subsidiaries, and Joint Ventures	0	0	'	'
CSX Corporation | Affiliates and Other Companies	'	'	'	'
Current Assets	'	'	'	'
Investment in Affiliates, Subsidiaries, and Joint Ventures	-39	-39	'	'
CSX Corporation | Investments in Consolidated Subsidiaries	'	'	'	'
Current Assets	'	'	'	'
Investment in Affiliates, Subsidiaries, and Joint Ventures	20,506	20,226	'	'
CSX Transportation	'	'	'	'
Current Assets	'	'	'	'
Cash and Cash Equivalents	91	91	208	235
Short-term Investments	0	0	'	'
Accounts Receivable - Net	191	240	'	'
Receivable from Affiliates	2,323	2,635	'	'
Materials and Supplies	259	252	'	'
Deferred Income Taxes	155	161	'	'
Other Current Assets	86	57	'	'
Total Current Assets	3,105	3,436	'	'
Properties	35,377	34,987	'	'
Accumulated Depreciation	-8,965	-8,778	'	'
Properties - Net	26,412	26,209	'	'
Other Long-term Assets	388	388	'	'
Total Assets	30,529	30,645	'	'
Current Liabilities:	'	'	'	'
Accounts Payable	758	809	'	'
Labor and Fringe Benefits Payable	340	491	'	'
Payable to Affiliates	539	535	'	'
Current Maturities of Long-term Debt	325	333	'	'
Income and Other Taxes Payable	342	479	'	'
Other Current Liabilities	109	103	'	'
Total Current Liabilities	2,546	2,886	'	'
Long-term Debt	713	714	'	'
Deferred Income Taxes	8,541	8,548	'	'
Other Long-term Liabilities	506	512	'	'
Total Liabilities	12,524	12,891	'	'
Shareholders' Equity	'	'	'	'
Common Stock $1 Par Value	181	181	'	'
Other Capital	5,077	5,077	'	'
Retained Earnings	12,759	12,514	'	'
Accumulated Other Comprehensive Loss	-37	-43	'	'
Noncontrolling Interest	25	25	'	'
Total Shareholders' Equity	18,005	17,754	'	'
Total Liabilities and Shareholders' Equity	30,529	30,645	'	'
CSX Transportation | Casualty, Environmental and Other [Member]	'	'	'	'
Current Liabilities:	'	'	'	'
Casualty, Environmental and Other Reserves	133	136	'	'
Casualty, Environmental and Other Reserves	218	231	'	'
CSX Transportation | Investments in Conrail	'	'	'	'
Current Assets	'	'	'	'
Investment in Affiliates, Subsidiaries, and Joint Ventures	0	0	'	'
CSX Transportation | Affiliates and Other Companies	'	'	'	'
Current Assets	'	'	'	'
Investment in Affiliates, Subsidiaries, and Joint Ventures	624	612	'	'
CSX Transportation | Investments in Consolidated Subsidiaries	'	'	'	'
Current Assets	'	'	'	'
Investment in Affiliates, Subsidiaries, and Joint Ventures	0	0	'	'
Eliminations and Other	'	'	'	'
Current Assets	'	'	'	'
Cash and Cash Equivalents	63	62	52	68
Short-term Investments	18	15	'	'
Accounts Receivable - Net	879	809	'	'
Receivable from Affiliates	-3,624	-3,776	'	'
Materials and Supplies	0	0	'	'
Deferred Income Taxes	-1	-1	'	'
Other Current Assets	6	6	'	'
Total Current Assets	-2,659	-2,885	'	'
Properties	2,226	2,196	'	'
Accumulated Depreciation	-1,144	-1,114	'	'
Properties - Net	1,082	1,082	'	'
Other Long-term Assets	-19	-14	'	'
Total Assets	-21,373	-21,318	'	'
Current Liabilities:	'	'	'	'
Accounts Payable	27	38	'	'
Labor and Fringe Benefits Payable	31	58	'	'
Payable to Affiliates	-3,602	-3,833	'	'
Current Maturities of Long-term Debt	0	0	'	'
Income and Other Taxes Payable	6	9	'	'
Other Current Liabilities	4	2	'	'
Total Current Liabilities	-3,518	-3,711	'	'
Long-term Debt	0	0	'	'
Deferred Income Taxes	187	178	'	'
Other Long-term Liabilities	-125	-121	'	'
Total Liabilities	-3,389	-3,585	'	'
Shareholders' Equity	'	'	'	'
Common Stock $1 Par Value	-181	-181	'	'
Other Capital	-5,077	-5,077	'	'
Retained Earnings	-12,759	-12,514	'	'
Accumulated Other Comprehensive Loss	37	43	'	'
Noncontrolling Interest	-4	-4	'	'
Total Shareholders' Equity	-17,984	-17,733	'	'
Total Liabilities and Shareholders' Equity	-21,373	-21,318	'	'
Eliminations and Other | Casualty, Environmental and Other [Member]	'	'	'	'
Current Liabilities:	'	'	'	'
Casualty, Environmental and Other Reserves	16	15	'	'
Casualty, Environmental and Other Reserves	67	69	'	'
Eliminations and Other | Investments in Conrail	'	'	'	'
Current Assets	'	'	'	'
Investment in Affiliates, Subsidiaries, and Joint Ventures	756	752	'	'
Eliminations and Other | Affiliates and Other Companies	'	'	'	'
Current Assets	'	'	'	'
Investment in Affiliates, Subsidiaries, and Joint Ventures	-27	-27	'	'
Eliminations and Other | Investments in Consolidated Subsidiaries	'	'	'	'
Current Assets	'	'	'	'
Investment in Affiliates, Subsidiaries, and Joint Ventures	($20,506)	($20,226)	'	'

Summarized_Consolidating_Cash_

Summarized Consolidating Cash Flow Statements (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2014	Mar. 29, 2013
Operating Activities	'	'
Net Cash Provided by (Used in) Operating Activities	$599	$731
Investing Activities	'	'
Property Additions	-475	-491
Purchase of Short-term Investments	-165	-290
Proceeds from Sales of Short-term Investments	409	534
Other Investing Activities	4	-18
Net Cash Provided by (Used in) Investing Activities	-227	-265
Financing Activities	'	'
Long-term debt repaid	-209	-413
Dividends Paid	-151	-143
Stock Options Exercised	0	6
Shares Repurchased	-127	0
Other Financing Activities	-2	5
Net Cash Used in Financing Activities	-489	-545
Net Decrease in Cash and Cash Equivalents	-117	-79
Cash and Cash Equivalents at Beginning of Period	592	784
Cash and Cash Equivalents at End of Period	475	705
CSX Corporation	'	'
Operating Activities	'	'
Net Cash Provided by (Used in) Operating Activities	113	272
Investing Activities	'	'
Property Additions	0	0
Purchase of Short-term Investments	-165	-285
Proceeds from Sales of Short-term Investments	407	510
Other Investing Activities	0	0
Net Cash Provided by (Used in) Investing Activities	242	225
Financing Activities	'	'
Long-term debt repaid	-200	-400
Dividends Paid	-151	-143
Stock Options Exercised	'	6
Shares Repurchased	-127	'
Other Financing Activities	5	4
Net Cash Used in Financing Activities	-473	-533
Net Decrease in Cash and Cash Equivalents	-118	-36
Cash and Cash Equivalents at Beginning of Period	439	481
Cash and Cash Equivalents at End of Period	321	445
CSX Transportation	'	'
Operating Activities	'	'
Net Cash Provided by (Used in) Operating Activities	669	689
Investing Activities	'	'
Property Additions	-443	-458
Purchase of Short-term Investments	0	0
Proceeds from Sales of Short-term Investments	0	0
Other Investing Activities	-67	-63
Net Cash Provided by (Used in) Investing Activities	-510	-521
Financing Activities	'	'
Long-term debt repaid	-9	-13
Dividends Paid	-143	-182
Stock Options Exercised	'	0
Shares Repurchased	0	'
Other Financing Activities	-7	0
Net Cash Used in Financing Activities	-159	-195
Net Decrease in Cash and Cash Equivalents	0	-27
Cash and Cash Equivalents at Beginning of Period	91	235
Cash and Cash Equivalents at End of Period	91	208
Eliminations and Other	'	'
Operating Activities	'	'
Net Cash Provided by (Used in) Operating Activities	-183	-230
Investing Activities	'	'
Property Additions	-32	-33
Purchase of Short-term Investments	0	-5
Proceeds from Sales of Short-term Investments	2	24
Other Investing Activities	71	45
Net Cash Provided by (Used in) Investing Activities	41	31
Financing Activities	'	'
Long-term debt repaid	0	0
Dividends Paid	143	182
Stock Options Exercised	'	0
Shares Repurchased	0	'
Other Financing Activities	0	1
Net Cash Used in Financing Activities	143	183
Net Decrease in Cash and Cash Equivalents	1	-16
Cash and Cash Equivalents at Beginning of Period	62	68
Cash and Cash Equivalents at End of Period	$63	$52