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Loss on Asset Disposal (Details) $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) locomotive
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on locomotives	$ (80)	$ (14)
Railroad Transportation Equipment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of locomotives sold | locomotive			703
Loss on locomotives			$ 385
Tax benefit on loss from sale of locomotives			$ 97

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- Definition

Effective Income Tax Rate reconciliation, Loss From Sale Of Assets

+ References

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Property, Plant and Equipment, Number of Locomotives Sold

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- Definition

Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

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