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Acquisitions, Divestitures and Exchanges, acquisitions (Details) $ in Millions | Mar. 31, 2016 USD ($)
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Aggregate license acquisitions |
Acquisitions, divestitures and exchanges |
License acquisition agreement amount | $ 54

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of agreement to acquire an indefinite-lived intangible asset, either individually or as part of a group. + References No definition available. + Details
Name: | usm_IndefiniteLivedIntangibleAssetAgreementAmount
Namespace Prefix: | usm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | usm_AcquisitionEventAxis=usm_AggregateLicenseAcquisitionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |