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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, 2024	Dec. 31, 2023
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 103,732	$ 93,352
Acquisitions	4,376	10,121
Dispositions, foreign currency effects and adjustments, net	(1,374)	259
Goodwill, Ending Balance	106,734	103,732
UnitedHealthcare
Goodwill [Line Items]
Goodwill, Beginning Balance	27,878	27,395
Acquisitions	0	296
Dispositions, foreign currency effects and adjustments, net	(717)	187
Goodwill, Ending Balance	27,161	27,878
Optum Health
Goodwill [Line Items]
Goodwill, Beginning Balance	37,079	29,238
Acquisitions	2,071	8,023
Dispositions, foreign currency effects and adjustments, net	(324)	(182)
Goodwill, Ending Balance	38,826	37,079
Optum Insight
Goodwill [Line Items]
Goodwill, Beginning Balance	19,307	17,244
Acquisitions	0	1,802
Dispositions, foreign currency effects and adjustments, net	(327)	261
Goodwill, Ending Balance	18,980	19,307
Optum Rx
Goodwill [Line Items]
Goodwill, Beginning Balance	19,468	19,475
Acquisitions	2,305	0
Dispositions, foreign currency effects and adjustments, net	(6)	(7)
Goodwill, Ending Balance	$ 21,767	$ 19,468

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