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Environmental Matters (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) DisposalSite | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Environmental Remediation Obligations [Abstract] |  |  |
Number of disposal sites | DisposalSite | 19 |  |
Environmental expenses | $ 12 | $ 12 | $ 10
Environmental liabilities | 10 | 10 |
Asset retirement obligation | $ 27 | $ 26 |

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- Definition Carrying value of the obligation (known or estimated) related to remediation costs as well as normal recurring expenses such as licensing, testing and waste disposal fees. + References No definition available. + Details
Name: | r_AccruedEnvironmentalLiabilities
Namespace Prefix: | r_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities. Also includes normal recurring expenses such as licensing, testing and waste disposal fees. + References No definition available. + Details
Name: | r_EnvironmentalExpenses
Namespace Prefix: | r_
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- Definition Number of disposal sites. + References No definition available. + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- References No definition available. + Details
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