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Cover Document - USD ($)
 12 Months Ended
Dec. 31, 2023
Jan. 31, 2024
Jun. 30, 2023
Cover Page [Abstract]      
Entity File Number 1-10864    
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2023    
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 UnitedHealth Group Center    
Entity Address, Address Line Two 9900 Bren Road East    
Entity Address, City or Town Minnetonka,    
Entity Address, State or Province MN    
Entity Address, Postal Zip Code 55343    
City Area Code 952    
Local Phone Number 936-1300    
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     $ 444,627,758,226
Entity Common Stock, Shares Outstanding   921,934,109  
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 2024 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