XML 110 R87.htm IDEA: XBRL DOCUMENT
v3.22.4

Note 14 - Debt - Schedule of Unsecured Debt (Details) (Parentheticals) | 12 Months Ended
--- | ---
Dec. 31, 2022
4.950% Notes, Due September 9, 2052 [Member] |
Debt Instrument, Interest Rate | 4.95%
Unsecured Debt [Member] | 2.8% Notes, Due February 14, 2032 [Member] |
Debt Instrument, Interest Rate | 2.80%
Debt Instrument, Maturity Date | Feb. 14, 2032
Unsecured Debt [Member] | 3.375% Notes, Due February 14, 2042 [Member] |
Debt Instrument, Interest Rate | 3.375%
Debt Instrument, Maturity Date | Feb. 14, 2042
Unsecured Debt [Member] | The 3.5% Notes, Due February 14, 2053 [Member] |
Debt Instrument, Interest Rate | 3.50%
Debt Instrument, Maturity Date | Feb. 14, 2053
Unsecured Debt [Member] | 3.85% Notes, Due February 14, 2072 [Member] |
Debt Instrument, Interest Rate | 3.85%
Debt Instrument, Maturity Date | Feb. 14, 2072
Unsecured Debt [Member] | 4.500% Notes Due January 20, 2033 [Member] |
Debt Instrument, Interest Rate | 4.50%
Debt Instrument, Maturity Date | Jan. 20, 2033
Unsecured Debt [Member] | 4.950% Notes, Due September 9, 2052 [Member] |
Debt Instrument, Interest Rate | 4.95%
Debt Instrument, Maturity Date | Sep. 09, 2052
Unsecured Debt [Member] | 5.150% Notes Due January 20, 2063 [Member] |
Debt Instrument, Interest Rate | 5.15%
Debt Instrument, Maturity Date | Jan. 20, 2063

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
Name: | us-gaap_DebtInstrumentMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DebtInstrumentAxis=unp_FourPointNineFivePercentNotesDueSeptember92052Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=unp_TwoPointEightPercentNotesDueFebruary142032Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=unp_ThreePointThreeSevenFivePercentNotesDueFebruary142042Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=unp_The35NotesDueFebruary142053Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=unp_ThreePointEightFivePercentNotesDueFebruary142072Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=unp_FourPointFivePercentNotesDueJanuary202033Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=unp_FivePointOneFivePercentNotesDueJanuary202063Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |