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General - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021
Disclosure of General Information [Line Items] |  |  |
Additional funds received from government by CARES Act |  |  | $ 189
Return of funds by CARES Act to government |  | $ 189 |
Medicare Accelerated and Advance Payment Program |  |  |
Disclosure of General Information [Line Items] |  |  |
Medicare accelerated payments received | $ 695 |  |

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- Definition Additional funds received from government by CARES Act. + References No definition available. + Details
Name: | uhs_AdditionalFundsReceivedFromGovernmentByCARESAct
Namespace Prefix: | uhs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Disclosure of general information. + References No definition available. + Details
Name: | uhs_DisclosureOfGeneralInformationLineItems
Namespace Prefix: | uhs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Medicare accelerated payments received. + References No definition available. + Details
Name: | uhs_MedicareAcceleratedPaymentsReceived
Namespace Prefix: | uhs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Return of funds by CARES Act to government. + References No definition available. + Details
Name: | uhs_ReturnOfFundsByCARESActToGovernment
Namespace Prefix: | uhs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_DeferredRevenueArrangementTypeAxis=uhs_MedicareAcceleratedAndAdvancePaymentProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |