Goodwill and Intangible Assets Changes in the Carrying Amount of Goodwill by Reporting Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 75,795	$ 71,337
Acquisitions	17,710	4,804
Foreign currency effects and adjustments, net	(153)	(346)
Goodwill, Ending Balance	93,352	75,795
UnitedHealthcare
Goodwill [Line Items]
Goodwill, Beginning Balance	27,389	27,785
Acquisitions	19	60
Foreign currency effects and adjustments, net	(13)	(456)
Goodwill, Ending Balance	27,395	27,389
Optum Health
Goodwill [Line Items]
Goodwill, Beginning Balance	24,224	19,844
Acquisitions	5,158	4,648
Foreign currency effects and adjustments, net	(144)	(268)
Goodwill, Ending Balance	29,238	24,224
Optum Insight
Goodwill [Line Items]
Goodwill, Beginning Balance	8,619	8,173
Acquisitions	8,623	96
Foreign currency effects and adjustments, net	2	350
Goodwill, Ending Balance	17,244	8,619
Optum Rx
Goodwill [Line Items]
Goodwill, Beginning Balance	15,563	15,535
Acquisitions	3,910	0
Foreign currency effects and adjustments, net	2	28
Goodwill, Ending Balance	$ 19,475	$ 15,563