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Properties - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) locomotive	Dec. 31, 2019 USD ($)
Property, Plant and Equipment [Line Items]
Gains and losses on properties	$ (86)	$ (39)	$ (42)
Interest costs incurred on debt	657	639	620
Interest costs capitalized	$ 11	$ 14	$ 16
Rail and other track material
Property, Plant and Equipment [Line Items]
Number of locomotives held for sale | locomotive		703
Gains and losses on properties		$ 385
Income tax benefit for locomotive retirement adjustment		$ (97)

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- Definition

Income Tax Expense (Benefit), One Time Impairment Loss, Adjustment for Locomotive Retirement, Amount

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Property, Plant And Equipment, Number Of Locomotives Classified As Assets-Held-For Sale

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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)
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Amount of interest capitalized during the period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
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Total interest costs incurred during the period and either capitalized or charged against earnings.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
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