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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, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 71,337	$ 65,659
Acquisitions	4,804	6,379
Foreign currency effects and adjustments, net	(346)	(701)
Goodwill, Ending Balance	75,795	71,337
UnitedHealthcare
Goodwill [Line Items]
Goodwill, Beginning Balance	27,785	27,228
Acquisitions	60	1,180
Foreign currency effects and adjustments, net	(456)	(623)
Goodwill, Ending Balance	27,389	27,785
Optum Health
Goodwill [Line Items]
Goodwill, Beginning Balance	19,844	15,342
Acquisitions	4,648	4,500
Foreign currency effects and adjustments, net	(268)	2
Goodwill, Ending Balance	24,224	19,844
Optum Insight
Goodwill [Line Items]
Goodwill, Beginning Balance	8,173	8,292
Acquisitions	96	0
Foreign currency effects and adjustments, net	350	(119)
Goodwill, Ending Balance	8,619	8,173
Optum Rx
Goodwill [Line Items]
Goodwill, Beginning Balance	15,535	14,797
Acquisitions	0	699
Foreign currency effects and adjustments, net	28	39
Goodwill, Ending Balance	$ 15,563	$ 15,535

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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