XML 112 R87.htm IDEA: XBRL DOCUMENT v3.24.0.1

Note 14 - Debt - Schedule of Debt (Details) (Parentheticals)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Notes Payable to Banks [Member]
Debt Instrument, Maturity Date	Feb. 14, 2072	Feb. 14, 2072
Notes Payable to Banks [Member] | Minimum [Member]
Debt Instrument, Interest Rate	2.20%	2.20%
Notes Payable to Banks [Member] | Maximum [Member]
Debt Instrument, Interest Rate	7.10%	7.10%
Equipment Trust Certificate [Member]
Debt Instrument, Maturity Date	Jan. 02, 2031	Jan. 02, 2031
Equipment Trust Certificate [Member] | Minimum [Member]
Debt Instrument, Interest Rate	2.60%	2.60%
Equipment Trust Certificate [Member] | Maximum [Member]
Debt Instrument, Interest Rate	6.20%	6.20%
Finance Lease [Member]
Debt Instrument, Maturity Date	Dec. 10, 2028	Dec. 10, 2028
Finance Lease [Member] | Minimum [Member]
Debt Instrument, Interest Rate	3.10%	3.10%
Finance Lease [Member] | Maximum [Member]
Debt Instrument, Interest Rate	6.80%	6.80%

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Latest date the outstanding debt instruments are required to be repaid, in YYYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_DebtInstrumentMaturityDateRangeEnd1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_NotesPayableToBanksMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_EquipmentTrustCertificateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=unp_FinanceLeaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: