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Commitments and Contingencies - Schedule of Number of Locomotives and Payments under Long-term Maintenance Program (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) locomotive | Dec. 31, 2019 USD ($) locomotive | Dec. 31, 2018 USD ($) locomotive
Commitments and Contingencies Disclosure [Abstract] |  |  |
Amounts Paid | $ | $ 158 | $ 139 | $ 170
Number of Locomotives | locomotive | 1,874 | 1,897 | 1,910

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- Definition Number of locomotives under the long-term maintenance program. + References No definition available. + Details
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- 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=120395209&loc=SL114868664-224227 + Details
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