XML 15 R37.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | Jun. 27, 2014 | Dec. 27, 2013
--- | --- | ---
Fair Value |  |
Fair Value, by Balance Sheet Grouping |  |
Investments | $ 394 | $ 668
Fair Value | Less than 1 year |  |
Fair Value, by Balance Sheet Grouping |  |
Investments | 216 | 487
Fair Value | 1 - 2 years |  |
Fair Value, by Balance Sheet Grouping |  |
Investments | 74 | 58
Fair Value | 2 - 5 years |  |
Fair Value, by Balance Sheet Grouping |  |
Investments | 84 | 105
Fair Value | Greater than 5 years |  |
Fair Value, by Balance Sheet Grouping |  |
Investments | 20 | 18
Fair Value | Certificates of Deposit and Commercial Paper |  |
Fair Value, by Balance Sheet Grouping |  |
Investments | 195 | 472
Fair Value | Corporate Bonds |  |
Fair Value, by Balance Sheet Grouping |  |
Investments | 135 | 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 | 379 | 653
Long-term Debt (Including Current Maturities) | 10,563 | 10,354
Fair Value | Level 2 | Certificates of Deposit and Commercial Paper |  |
Fair Value, by Balance Sheet Grouping |  |
Investments | 195 | 472
Fair Value | Level 2 | Corporate Bonds |  |
Fair Value, by Balance Sheet Grouping |  |
Investments | 135 | 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 | 393 | 668
Carrying Value | Level 2 |  |
Fair Value, by Balance Sheet Grouping |  |
Long-term Debt (Including Current Maturities) | $ 9,309 | $ 9,555

X
- Definition Fair value portion of investment securities, including, but not limited to, marketable securities and derivative financial instruments. + References No definition available. + Details
Name: | csx_FairValueInvestmentsDisclosure
Namespace Prefix: | csx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + 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 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AvailableForSaleSecuritiesAmortizedCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13476-108611 + Details
Name: | us-gaap_DebtInstrumentFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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