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Earnings Per Share - Reconciliation (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]        
Net income attributable to UScellular shareholders $ 35 $ 68 $ 95 $ 139
Weighted average number of shares used in basic earnings per share (in shares) 87 86 87 86
Effects of dilutive securities (in shares) 1 1 1 1
Weighted average number of shares used in diluted earnings per share (in shares) 88 87 88 87
Basic earnings per share attributable to UScellular shareholders (USD per share) $ 0.40 $ 0.79 $ 1.10 $ 1.62
Diluted earnings per share attributable to UScellular shareholders (in shares) $ 0.39 $ 0.78 $ 1.08 $ 1.59