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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, 2018 USD ($) locomotive | Dec. 31, 2017 USD ($) locomotive | Dec. 30, 2016 USD ($) locomotive
Commitments and Contingencies Disclosure [Abstract] |  |  |
Amounts Paid | $ | $ 145 | $ 197 | $ 230
Number of Locomotives | locomotive | 1,910 | 2,062 | 2,243

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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=115205541&loc=SL114868664-224227 + Details
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