XML 113 R70.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Commitments and Contingencies - Schedule of Number of Locomotives and Payments under Long-term Maintenance Program (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) locomotive | Dec. 31, 2018 USD ($) locomotive | Dec. 31, 2017 USD ($) locomotive
Commitments and Contingencies Disclosure [Abstract] |  |  |
Amounts Paid | $ | $ 139 | $ 170 | $ 197
Number of Locomotives | locomotive | 1,897 | 1,910 | 2,062

X
- Definition Number of locomotives under the long-term maintenance program. + References No definition available. + Details
Name: | csx_NumberOfLocomotivesUnderLongTermMaintenancePlan
Namespace Prefix: | csx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cost of maintenance incurred and directly related to good produced and service rendered. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(2)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
Name: | us-gaap_CostMaintenance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration