Stock-Based Compensation - UScellular, Deferred Stock Units (Details) - Deferred Compensation Stock Units - UScellular Long-Term Incentive Plans - Common Shares	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of match from annual bonus	33.00%
Percent of match up to 50% from annual bonus		25.00%	25.00%
Percent of match above 50% from annual bonus		33.00%	33.00%
Award vesting period	3 years

Defined Contribution Plan, Employer Matching Contribution, Percent of Match above 50% from Annual Bonus

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- Definition

Defined Contribution Plan, Employer Matching Contribution, Percent of Match up to 50% from Annual Bonus

+ References

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- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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