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Goodwill and Intangible Assets Changes in the Carrying Amount of Goodwill by Reporting Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Goodwill [Line Items]    
Goodwill, Beginning Balance $ 93,352 $ 75,795
Acquisitions 10,121 17,710
Foreign currency effects and adjustments, net 259 (153)
Goodwill, Ending Balance 103,732 93,352
UnitedHealthcare    
Goodwill [Line Items]    
Goodwill, Beginning Balance 27,395 27,389
Acquisitions 296 19
Foreign currency effects and adjustments, net 187 (13)
Goodwill, Ending Balance 27,878 27,395
Optum Health    
Goodwill [Line Items]    
Goodwill, Beginning Balance 29,238 24,224
Acquisitions 8,023 5,158
Foreign currency effects and adjustments, net (182) (144)
Goodwill, Ending Balance 37,079 29,238
Optum Insight    
Goodwill [Line Items]    
Goodwill, Beginning Balance 17,244 8,619
Acquisitions 1,802 8,623
Foreign currency effects and adjustments, net 261 2
Goodwill, Ending Balance 19,307 17,244
Optum Rx    
Goodwill [Line Items]    
Goodwill, Beginning Balance 19,475 15,563
Acquisitions 0 3,910
Foreign currency effects and adjustments, net (7) 2
Goodwill, Ending Balance $ 19,468 $ 19,475