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Casualty, Environmental and Other Reserves (Details) (USD $) In Millions, unless otherwise specified | Sep. 28, 2012 claims | Dec. 30, 2011 | Jun. 01, 2010 | May 31, 2010
--- | --- | --- | --- | ---
All Contingencies Reserves [Line Items] |  |  |  |  |  |
Casualty, environmental and other reserves, current | $ 169 |  | $ 167 |  |  |
Casualty, environmental and other reserves, Long-term | 319 |  | 352 |  |  |
Casualty, environmental and other reserves, Total | 488 |  | 519 |  |  |
Casualty [Member] |  |  |  |  |  |
All Contingencies Reserves [Line Items] |  |  |  |  |  |
Casualty, environmental and other reserves, current | 110 |  | 110 |  |  |
Casualty, environmental and other reserves, Long-term | 234 |  | 262 |  |  |
Casualty, environmental and other reserves, Total | 344 |  | 372 |  |  |
Self-insured retention amount |  |  |  |  | 50 | 25
Number of Claims Expected to Exceed Self Insured Retention Amount | 0 |  |  |  |  |
Personal Injury [Member] |  |  |  |  |  |
All Contingencies Reserves [Line Items] |  |  |  |  |  |
Casualty, environmental and other reserves, current | 93 |  | 93 |  |  |
Casualty, environmental and other reserves, Long-term | 151 |  | 168 |  |  |
Casualty, environmental and other reserves, Total | 244 |  | 261 |  |  |
Occupational [Member] |  |  |  |  |  |
All Contingencies Reserves [Line Items] |  |  |  |  |  |
Casualty, environmental and other reserves, current | 6 |  | 6 |  |  |
Casualty, environmental and other reserves, Long-term | 31 |  | 37 |  |  |
Casualty, environmental and other reserves, Total | 37 |  | 43 |  |  |
Asbestos [Member] |  |  |  |  |  |
All Contingencies Reserves [Line Items] |  |  |  |  |  |
Casualty, environmental and other reserves, current | 11 |  | 11 |  |  |
Casualty, environmental and other reserves, Long-term | 52 |  | 57 |  |  |
Casualty, environmental and other reserves, Total | 63 |  | 68 |  |  |
Environmental [Member] |  |  |  |  |  |
All Contingencies Reserves [Line Items] |  |  |  |  |  |
Casualty, environmental and other reserves, current | 39 |  | 31 |  |  |
Casualty, environmental and other reserves, Long-term | 40 |  | 52 |  |  |
Casualty, environmental and other reserves, Total | 79 |  | 83 |  |  |
Environmental impaired sites | 256 |  |  |  |  |
Other [Member] |  |  |  |  |  |
All Contingencies Reserves [Line Items] |  |  |  |  |  |
Casualty, environmental and other reserves, current | 20 | [1] | 26 | [1] |  |
Casualty, environmental and other reserves, Long-term | 45 | [1] | 38 | [1] |  |
Casualty, environmental and other reserves, Total | $ 65 | [1] | $ 64 | [1] |  |
[1] | Separation liabilities and freight rate dispute reserves have been reclassified to other current and long-term liabilities.

X
- Definition Total of the carrying amount as of the balance sheet date of the current and noncurrent reserves including casualty, environmental, separation, and other + References No definition available. + Details
Name: | csx_AllReservesTotalBalance
Namespace Prefix: | csx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Total of current reserves including casualty, environmental and other reserves + References No definition available. + Details
Name: | csx_AllReservesTotalCurrentBalance
Namespace Prefix: | csx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Total of non-current reserves including casualty, environmental and other reserves + References No definition available. + Details
Name: | csx_AllReservesTotalNoncurrentBalance
Namespace Prefix: | csx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Total number of claims expected to exceed self-insured retention amount, as of the balance sheet date. + References No definition available. + Details
Name: | csx_LossContingencyNumberOfClaimsExpectedToExceedSelfInsuredRetentionAmount
Namespace Prefix: | csx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of environmentally impaired sites at which the Company has been identified as a potentially responsible party. + References No definition available. + Details
Name: | csx_NumberOfImpairedSites
Namespace Prefix: | csx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | instant