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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, 2020 | Dec. 31, 2019
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | $ 65,659 | $ 58,910
Acquisitions | 6,379 | 6,944
Foreign currency effects and adjustments, net | (701) | (195)
Goodwill, Ending Balance | 71,337 | 65,659
UnitedHealthcare |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 27,228 | 26,400
Acquisitions | 1,180 | 1,022
Foreign currency effects and adjustments, net | (623) | (194)
Goodwill, Ending Balance | 27,785 | 27,228
OptumHealth |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 15,342 | 11,947
Acquisitions | 4,500 | 3,395
Foreign currency effects and adjustments, net | 2 | 0
Goodwill, Ending Balance | 19,844 | 15,342
OptumInsight |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 8,292 | 5,772
Acquisitions | 0 | 2,521
Foreign currency effects and adjustments, net | (119) | (1)
Goodwill, Ending Balance | 8,173 | 8,292
OptumRx |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 14,797 | 14,791
Acquisitions | 699 | 6
Foreign currency effects and adjustments, net | 39 | 0
Goodwill, Ending Balance | $ 15,535 | $ 14,797

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