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Stock-Based Compensation - UScellular, Stock options (Details) - UScellular Long-Term Incentive Plans - Common Shares - Stock Options - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020
Stock compensation, number of shares
Stock options outstanding	460		418
Stock compensation, other information
Stock options outstanding - weighted average exercise price (USD per share)	$ 42.20		$ 42.23
Aggregate intrinsic value, options exercised	$ 3	$ 19

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

+ References

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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