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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Stock compensation, number of shares      
Stock options outstanding 348 378  
Stock compensation, other information      
Stock options outstanding - weighted average exercise price (USD per share) $ 42.41 $ 42.18  
Aggregate intrinsic value, options exercised $ 0   $ 0
Maximum      
Stock compensation, other information      
Aggregate intrinsic value, options exercised   $ 1