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Note 6 - Other Income - Schedule of Other Income (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Real estate income [a]	[1]	$ 57	$ 69	$ 122	$ 245
Net periodic pension benefit/(costs)		15	14	30	28
Interest from IRS refund claims		24	0	24	0
Non-operating property environmental remediation and restoration		(8)	(3)	(14)	(22)
Other		15	13	33	26
Total		$ 103	$ 93	$ 195	$ 277
[1] The six-months ended June 30, 2023, includes a one-time $107 million transaction.

X

- Definition

Represents non-operating environmental income.

+ References

No definition available.

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X

- Definition

Amount of income related to federal tax refund claims.

+ References

No definition available.

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Namespace Prefix:	unp_
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X

- Definition

The amount of income (expense) from other nonoperating activities not otherwise specified.

+ References

No definition available.

+ Details

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X

- Definition

Amount of expense (reversal of expense) for net periodic benefit cost components, excluding service cost component, of defined benefit plan. Amount includes, but is not limited to, interest cost, expected (return) loss on plan asset, amortization of prior service cost (credit), amortization of (gain) loss, amortization of transition (asset) obligation, settlement (gain) loss, curtailment (gain) loss and certain termination benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 3A
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A

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- Definition

Amount of income (expense) related to nonoperating activities, classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(9))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

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- Definition

The net cost of operation of other real estate (including provisions for real estate losses, rental income, and gains and losses on sales of real estate).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(14)(d))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

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