{
 "company": "union-pacific",
 "snapshot": "FY2026Q3_32422f77",
 "documents": {
  "10-K:0000100885-21-000068": {
   "kind": "filing",
   "form": "10-K",
   "accession": "0000100885-21-000068",
   "report_date": "2020-12-31",
   "filed": "2021-02-05",
   "fiscal_period": "FY2020 FY",
   "url": "https://www.sec.gov/Archives/edgar/data/100885/000010088521000068/unp-20201231x10k.htm",
   "index_url": "https://www.sec.gov/Archives/edgar/data/100885/000010088521000068/"
  },
  "10-K:0000100885-25-000042": {
   "kind": "filing",
   "form": "10-K",
   "accession": "0000100885-25-000042",
   "report_date": "2024-12-31",
   "filed": "2025-02-07",
   "fiscal_period": "FY2024 FY",
   "url": "https://www.sec.gov/Archives/edgar/data/100885/000010088525000042/unp-20241231.htm",
   "index_url": "https://www.sec.gov/Archives/edgar/data/100885/000010088525000042/"
  },
  "10-K:0000100885-26-000037": {
   "kind": "filing",
   "form": "10-K",
   "accession": "0000100885-26-000037",
   "report_date": "2025-12-31",
   "filed": "2026-02-06",
   "fiscal_period": "FY2025 FY",
   "url": "https://www.sec.gov/Archives/edgar/data/100885/000010088526000037/unp-20251231.htm",
   "index_url": "https://www.sec.gov/Archives/edgar/data/100885/000010088526000037/"
  },
  "10-K:0001437749-22-002494": {
   "kind": "filing",
   "form": "10-K",
   "accession": "0001437749-22-002494",
   "report_date": "2021-12-31",
   "filed": "2022-02-04",
   "fiscal_period": "FY2021 FY",
   "url": "https://www.sec.gov/Archives/edgar/data/100885/000143774922002494/unp20211231_10k.htm",
   "index_url": "https://www.sec.gov/Archives/edgar/data/100885/000143774922002494/"
  },
  "10-K:0001437749-23-002959": {
   "kind": "filing",
   "form": "10-K",
   "accession": "0001437749-23-002959",
   "report_date": "2022-12-31",
   "filed": "2023-02-10",
   "fiscal_period": "FY2022 FY",
   "url": "https://www.sec.gov/Archives/edgar/data/100885/000143774923002959/unp20221231_10k.htm",
   "index_url": "https://www.sec.gov/Archives/edgar/data/100885/000143774923002959/"
  },
  "10-K:0001437749-24-003599": {
   "kind": "filing",
   "form": "10-K",
   "accession": "0001437749-24-003599",
   "report_date": "2023-12-31",
   "filed": "2024-02-09",
   "fiscal_period": "FY2023 FY",
   "url": "https://www.sec.gov/Archives/edgar/data/100885/000143774924003599/unp20231231_10k.htm",
   "index_url": "https://www.sec.gov/Archives/edgar/data/100885/000143774924003599/"
  },
  "10-Q:0000100885-20-000143": {
   "kind": "filing",
   "form": "10-Q",
   "accession": "0000100885-20-000143",
   "report_date": "2020-03-31",
   "filed": "2020-04-23",
   "fiscal_period": "FY2020 Q1",
   "url": "https://www.sec.gov/Archives/edgar/data/100885/000010088520000143/unp-20200331x10q.htm",
   "index_url": "https://www.sec.gov/Archives/edgar/data/100885/000010088520000143/"
  },
  "10-Q:0000100885-20-000221": {
   "kind": "filing",
   "form": "10-Q",
   "accession": "0000100885-20-000221",
   "report_date": "2020-06-30",
   "filed": "2020-07-23",
   "fiscal_period": "FY2020 Q2",
   "url": "https://www.sec.gov/Archives/edgar/data/100885/000010088520000221/unp-20200630x10q.htm",
   "index_url": "https://www.sec.gov/Archives/edgar/data/100885/000010088520000221/"
  },
  "10-Q:0000100885-20-000304": {
   "kind": "filing",
   "form": "10-Q",
   "accession": "0000100885-20-000304",
   "report_date": "2020-09-30",
   "filed": "2020-10-22",
   "fiscal_period": "FY2020 Q3",
   "url": "https://www.sec.gov/Archives/edgar/data/100885/000010088520000304/unp-20200930x10q.htm",
   "index_url": "https://www.sec.gov/Archives/edgar/data/100885/000010088520000304/"
  },
  "10-Q:0000100885-21-000162": {
   "kind": "filing",
   "form": "10-Q",
   "accession": "0000100885-21-000162",
   "report_date": "2021-03-31",
   "filed": "2021-04-22",
   "fiscal_period": "FY2021 Q1",
   "url": "https://www.sec.gov/Archives/edgar/data/100885/000010088521000162/unp-20210331x10q.htm",
   "index_url": "https://www.sec.gov/Archives/edgar/data/100885/000010088521000162/"
  },
  "10-Q:0000100885-21-000250": {
   "kind": "filing",
   "form": "10-Q",
   "accession": "0000100885-21-000250",
   "report_date": "2021-06-30",
   "filed": "2021-07-22",
   "fiscal_period": "FY2021 Q2",
   "url": "https://www.sec.gov/Archives/edgar/data/100885/000010088521000250/unp-20210630x10q.htm",
   "index_url": "https://www.sec.gov/Archives/edgar/data/100885/000010088521000250/"
  },
  "10-Q:0000100885-21-000353": {
   "kind": "filing",
   "form": "10-Q",
   "accession": "0000100885-21-000353",
   "report_date": "2021-09-30",
   "filed": "2021-10-21",
   "fiscal_period": "FY2021 Q3",
   "url": "https://www.sec.gov/Archives/edgar/data/100885/000010088521000353/unp-20210930x10q.htm",
   "index_url": "https://www.sec.gov/Archives/edgar/data/100885/000010088521000353/"
  },
  "10-Q:0000100885-25-000151": {
   "kind": "filing",
   "form": "10-Q",
   "accession": "0000100885-25-000151",
   "report_date": "2025-03-31",
   "filed": "2025-04-24",
   "fiscal_period": "FY2025 Q1",
   "url": "https://www.sec.gov/Archives/edgar/data/100885/000010088525000151/unp-20250331.htm",
   "index_url": "https://www.sec.gov/Archives/edgar/data/100885/000010088525000151/"
  },
  "10-Q:0000100885-25-000253": {
   "kind": "filing",
   "form": "10-Q",
   "accession": "0000100885-25-000253",
   "report_date": "2025-06-30",
   "filed": "2025-07-24",
   "fiscal_period": "FY2025 Q2",
   "url": "https://www.sec.gov/Archives/edgar/data/100885/000010088525000253/unp-20250630.htm",
   "index_url": "https://www.sec.gov/Archives/edgar/data/100885/000010088525000253/"
  },
  "10-Q:0000100885-25-000321": {
   "kind": "filing",
   "form": "10-Q",
   "accession": "0000100885-25-000321",
   "report_date": "2025-09-30",
   "filed": "2025-10-23",
   "fiscal_period": "FY2025 Q3",
   "url": "https://www.sec.gov/Archives/edgar/data/100885/000010088525000321/unp-20250930.htm",
   "index_url": "https://www.sec.gov/Archives/edgar/data/100885/000010088525000321/"
  },
  "10-Q:0000100885-26-000155": {
   "kind": "filing",
   "form": "10-Q",
   "accession": "0000100885-26-000155",
   "report_date": "2026-03-31",
   "filed": "2026-04-23",
   "fiscal_period": "FY2026 Q1",
   "url": "https://www.sec.gov/Archives/edgar/data/100885/000010088526000155/unp-20260331.htm",
   "index_url": "https://www.sec.gov/Archives/edgar/data/100885/000010088526000155/"
  },
  "10-Q:0000100885-26-000250": {
   "kind": "filing",
   "form": "10-Q",
   "accession": "0000100885-26-000250",
   "report_date": "2026-06-30",
   "filed": "2026-07-23",
   "fiscal_period": "FY2026 Q2",
   "url": "https://www.sec.gov/Archives/edgar/data/100885/000010088526000250/unp-20260630.htm",
   "index_url": "https://www.sec.gov/Archives/edgar/data/100885/000010088526000250/"
  },
  "10-Q:0000100885-26-000321": {
   "kind": "filing",
   "form": "10-Q",
   "accession": "0000100885-26-000321",
   "report_date": "2026-09-30",
   "filed": "2026-10-22",
   "fiscal_period": "FY2026 Q3",
   "url": "https://www.sec.gov/Archives/edgar/data/100885/000010088526000321/unp-20260930.htm",
   "index_url": "https://www.sec.gov/Archives/edgar/data/100885/000010088526000321/"
  },
  "10-Q:0001437749-22-009414": {
   "kind": "filing",
   "form": "10-Q",
   "accession": "0001437749-22-009414",
   "report_date": "2022-03-31",
   "filed": "2022-04-21",
   "fiscal_period": "FY2022 Q1",
   "url": "https://www.sec.gov/Archives/edgar/data/100885/000143774922009414/unp20220331_10q.htm",
   "index_url": "https://www.sec.gov/Archives/edgar/data/100885/000143774922009414/"
  },
  "10-Q:0001437749-22-017515": {
   "kind": "filing",
   "form": "10-Q",
   "accession": "0001437749-22-017515",
   "report_date": "2022-06-30",
   "filed": "2022-07-21",
   "fiscal_period": "FY2022 Q2",
   "url": "https://www.sec.gov/Archives/edgar/data/100885/000143774922017515/unp20220525_10q.htm",
   "index_url": "https://www.sec.gov/Archives/edgar/data/100885/000143774922017515/"
  },
  "10-Q:0001437749-22-024458": {
   "kind": "filing",
   "form": "10-Q",
   "accession": "0001437749-22-024458",
   "report_date": "2022-09-30",
   "filed": "2022-10-20",
   "fiscal_period": "FY2022 Q3",
   "url": "https://www.sec.gov/Archives/edgar/data/100885/000143774922024458/unp20220930_10q.htm",
   "index_url": "https://www.sec.gov/Archives/edgar/data/100885/000143774922024458/"
  },
  "10-Q:0001437749-23-010730": {
   "kind": "filing",
   "form": "10-Q",
   "accession": "0001437749-23-010730",
   "report_date": "2023-03-31",
   "filed": "2023-04-20",
   "fiscal_period": "FY2023 Q1",
   "url": "https://www.sec.gov/Archives/edgar/data/100885/000143774923010730/unp20230331b_10q.htm",
   "index_url": "https://www.sec.gov/Archives/edgar/data/100885/000143774923010730/"
  },
  "10-Q:0001437749-23-020699": {
   "kind": "filing",
   "form": "10-Q",
   "accession": "0001437749-23-020699",
   "report_date": "2023-06-30",
   "filed": "2023-07-26",
   "fiscal_period": "FY2023 Q2",
   "url": "https://www.sec.gov/Archives/edgar/data/100885/000143774923020699/unp20230630_10q.htm",
   "index_url": "https://www.sec.gov/Archives/edgar/data/100885/000143774923020699/"
  },
  "10-Q:0001437749-23-028607": {
   "kind": "filing",
   "form": "10-Q",
   "accession": "0001437749-23-028607",
   "report_date": "2023-09-30",
   "filed": "2023-10-19",
   "fiscal_period": "FY2023 Q3",
   "url": "https://www.sec.gov/Archives/edgar/data/100885/000143774923028607/unp20230930_10q.htm",
   "index_url": "https://www.sec.gov/Archives/edgar/data/100885/000143774923028607/"
  },
  "10-Q:0001437749-24-013206": {
   "kind": "filing",
   "form": "10-Q",
   "accession": "0001437749-24-013206",
   "report_date": "2024-03-31",
   "filed": "2024-04-25",
   "fiscal_period": "FY2024 Q1",
   "url": "https://www.sec.gov/Archives/edgar/data/100885/000143774924013206/unp20240331_10q.htm",
   "index_url": "https://www.sec.gov/Archives/edgar/data/100885/000143774924013206/"
  },
  "10-Q:0001437749-24-023463": {
   "kind": "filing",
   "form": "10-Q",
   "accession": "0001437749-24-023463",
   "report_date": "2024-06-30",
   "filed": "2024-07-25",
   "fiscal_period": "FY2024 Q2",
   "url": "https://www.sec.gov/Archives/edgar/data/100885/000143774924023463/unp20240630c_10q.htm",
   "index_url": "https://www.sec.gov/Archives/edgar/data/100885/000143774924023463/"
  },
  "10-Q:0001437749-24-032008": {
   "kind": "filing",
   "form": "10-Q",
   "accession": "0001437749-24-032008",
   "report_date": "2024-09-30",
   "filed": "2024-10-24",
   "fiscal_period": "FY2024 Q3",
   "url": "https://www.sec.gov/Archives/edgar/data/100885/000143774924032008/unp20240930_10q.htm",
   "index_url": "https://www.sec.gov/Archives/edgar/data/100885/000143774924032008/"
  }
 }
}
