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Cover Document - USD ($)
 12 Months Ended
Dec. 31, 2024
Jan. 31, 2025
Jun. 30, 2024
Cover Page [Abstract]      
Entity File Number 1-10864    
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment Flag false    
Document Transition Report false    
Entity Registrant Name UnitedHealth Group Incorporated    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 41-1321939    
Entity Address, Address Line One 1 Health Drive    
Entity Address, City or Town Eden Prairie,    
Entity Address, State or Province MN    
Entity Address, Postal Zip Code 55344    
Other Address, Address line one 655 New York Avenue NW    
Other Entity Address, City or Town Washington,    
Other Entity Address, State or Province DC    
Other Entity Address, Postal Zip Code 20001    
City Area Code 800    
Local Phone Number 328-5979    
Title of 12(b) Security Common Stock, $.01 par value    
Trading Symbol UNH    
Security Exchange Name NYSE    
Well known seasoned issuer Yes    
Entity Voluntary Filers No    
Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Public Float     $ 468,433,146,650
Entity Common Stock, Shares Outstanding   914,712,333  
Documents Incorporated by Reference The information required by Part III of this report, to the extent not set forth herein, is incorporated by reference from the registrant’s definitive proxy statement relating to its 2025 Annual Meeting of Shareholders. Such proxy statement will be filed with the Securities and Exchange Commission within 120 days after the end of the fiscal year to which this report relates.    
Entitiy Central Index Key 0000731766    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false