Stock-Based Compensation - U.S. Cellular, Overview (Details) - Common Shares	12 Months Ended
Dec. 31, 2019 shares
U.S. Cellular Long-Term Incentive Plans \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining contractual term	10 years
Award vesting period	3 years
U.S. Cellular \| U.S. Cellular Long-Term Incentive Plans
Stock-based compensation, overview
Shares reserved	12,867,000
U.S. Cellular \| Non-Employee Directors' Plan
Stock-based compensation, overview
Shares reserved	123,000
Retired Employees \| U.S. Cellular Long-Term Incentive Plans \| Stock Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable term	90 days
Retired Employees \| U.S. Cellular Long-Term Incentive Plans \| Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable term	1 year
Terminated Employees \| U.S. Cellular Long-Term Incentive Plans \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	30 days

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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.

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Number of shares authorized for issuance under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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