XML 108 R85.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Common Shareholders' Equity (Details) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2017 shares | Nov. 30, 2009 shares | Dec. 31, 2021 vote shares
Series A Common Shares |  |  |
Common shareholders' equity, other disclosures |  |  |
Number of votes | vote |  |  | 10
Voting rights for number of board of directors |  |  | 75%
Common Shares |  |  |
Share repurchases |  |  |
Repurchase authorization, cumulative shares authorized (in shares) |  |  | 3,517,000
Stock Repurchase Program Additional Number Of Shares Authorized To Be Repurchased Per Year |  | 1,300,000 |
Common shareholders' equity, other disclosures |  |  |
Number of votes | vote |  |  | 1
Voting rights for number of board of directors |  |  | 25%
Common Shares | Maximum |  |  |
Share repurchases |  |  |
Stock Repurchase Program Additional Number Of Shares Authorized To Be Repurchased Per Year | 1,300,000 |  |
Common Shares | Minimum |  |  |
Share repurchases |  |  |
Stock Repurchase Program Additional Number Of Shares Authorized To Be Repurchased Per Year | 0 |  |
Common Shares | 401(k) |  |  |
Common shareholders' equity, other disclosures |  |  |
Shares reserved (in shares) |  |  | 67,000

X
- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
Name: | us-gaap_CommonStockVotingRights
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number Of Votes + References No definition available. + Details
Name: | usm_NumberOfVotes
Namespace Prefix: | usm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | usm_RepurchaseProgramAbstract
Namespace Prefix: | usm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The increase in number of shares allowed to be repurchased per year. This amount is an addition to the balance of allowable share repurchases from the prior year and has been authorized by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
Name: | usm_StockRepurchaseProgramAdditionalNumberOfSharesAuthorizedToBeRepurchasedPerYear
Namespace Prefix: | usm_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanNameAxis=usm_RetirementSavings401kPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |