XML 25 R1.htm IDEA: XBRL DOCUMENT v3.25.0.1
Cover - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2024
Jan. 31, 2025
Jun. 28, 2024
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 1-6075    
Entity Registrant Name UNION PACIFIC CORP    
Entity Incorporation, State or Country Code UT    
Entity Tax Identification Number 13-2626465    
Entity Address, Address Line One 1400 Douglas Street    
Entity Address, City or Town Omaha    
Entity Address, State or Province NE    
Entity Address, Postal Zip Code 68179    
City Area Code 402    
Local Phone Number 544-5000    
Title of 12(b) Security Common Stock (Par Value $2.50 per share)    
Trading Symbol UNP    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 137.8
Entity Common Stock, Shares Outstanding   604,286,378  
Documents Incorporated by Reference Portions of the registrant’s definitive Proxy Statement for the Annual Meeting of Shareholders to be held on May 8, 2025, are incorporated by reference into Part III of this report. The registrant’s Proxy Statement will be filed with the Securities and Exchange Commission (SEC) within 120 days after the end of the fiscal year that this report relates pursuant to Regulation 14A.    
Entity Central Index Key 0000100885    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment Flag false